Have affected a data manipulation at a Forensics Lab in manchester. The data is used by Police Forces across the uk. 50 prosecutions into driving offences have already been stopped, and there are fears they could be many more. A glossy promotional video for randox testing services, used by Police Forces to check samples for drugs, testing that its now clear has been unreliable for years. My advice from the Forensic Science regulator was that up to 10,000 cases, spanning back to late 2013, could no longer be fully relied upon in the criminaljustice system. 10,000 cases. Defence lawyer nick freeman spotted the problem when one of his clients, whod admitted using a small amount of cannabis, tested positive for drugs he knew he hadnt taken. When we got the report from randox, it suggested a much larger amount than had been anticipated but, more pertinently, it also suggested that hed consumed cocaine and another substance, and he hadnt consumed any other substance, as far as he was concerned. Two employees from randoxs Manchester Laboratory are suspected of not redoing tests that had failed quality checks. Theyve been arrested, but not charged. The company has apologised and is paying for thousands of retests. The actual number of miscarriages ofjustice isnt clear yet. The Crown Prosecution Service has dropped 50 prosecutions for drug driving that hadnt come to court yet and two cases of death by careless driving involving drugs have been referred back here to the court of appeal. And there are now concerns about work done by these same two employees on family cases at Trimega Laboratories between 2010 and 2014 before it was taken over by randox. Daniel sandford, bbc news, at the court of appeal. Mark urban looks now at the legacy of the man known as the butcher of bosnia. A warning that some viewers may find parts of this programme upsetting. In the 1990s, terrible things happened here. And even now, bosnias earth guards its secrets. Gunshots. But in order to escape its past, this country must confront it again, with the imminent verdict on general ratko mladic, whose list of war crimes led him to be dubbed the butcher of bosnia. Music continues. In an old factory in central bosnia, the human cost of the war is still being measured. For it is here that unidentified corpses from mass graves are being delivered even today, and the families of 30,000 still missing search for answers. This is overwhelming, in a certain way. There are pictures of the missing. There are human remains pretty much everywhere here, by the hundreds. And then, at the end there, there are scraps of clothing and other things that have been recovered with them. And this place is the main hope that a lot of the families of those missing have for discovering what on earth happened to a loved one, who just disappeared all those years ago. Having covered the war 25 years ago, ive come back to explore the impact that one particularly malign man had on the lives of thousands. Ratko mladic commanded serb forces in the bosnian war. He is now facing a verdict on an enormous catalogue of war crimes, including genocide. It has taken six years to try. Four days ago marked two decades since ratko mladic became the commander of the main staff of the army of republika srpska, the vrs. On that day he assumed the mantle of realising, through military might, the criminal goals of ethnically cleansing much of bosnia. Musreta sivac was a judge herself in the North Western town of prijedor when serb troops took it over in may 1992. She was fired and became one of thousands of muslims sent to 0marska, an iron ore plant that would become infamous as a camp where, in a few months, 700 inmates died. 0marska was the product of what was called ethnic cleansing driving non serbs out of much of bosnia. 37 women were used to serve in the camps dining hall. During the day they could hear torture going on in their nearby dormitories, and night brought its own anguish. I have to admit, somewhat ashamed to admit it, but i was a little sceptical of some of the reports that initially emerged in 1992 about what was happening to people in these camps. But pretty quickly it did become clear that terrible things were happening, and actually it was the human suffering caused in that initial phase of ethnic cleansing and murder and rape that went on in the north west of bosnia here that caused the International Criminal tribunal to be formed, and set in train the whole process of International Justice that will culminate in the sentencing of general mladic. 0urfilming was stopped by security guards. Whats the problem . Hes saying that we are not allowed to film the factory. The iron plant is now in action again and a foreign firm, but its a measure of the sensitivities that 0marska still generates. Mr kvocka, please rise. Early on, the Hague Tribunal tried several of the 0marska guards. One of those trials featured miroslav kvocka. A policeman at the start of the war, he was described in court as Deputy Commander of the camp. Then, as now, he portrays himself as someone who saved his muslim wifes relatives from the horror of the camp. The chamber considers that isolated acts of kindness to some prisoners do not absolve an individual of crimes which may have been committed. The court said he was culpable ofjoint enterprise. He knew what was going on. The chamber finds you guilty of the crime against humanity persecution, and the war crimes murder and torture. In the war we used to travel into sarajevo via mount igman. Were here again. This place, a remnant of the winter olympics, became a battleground as the focus of the war shifted from the area around prijedor to bosnias capital. In that long fight, a whole new chapter of war crimes began. Very quickly after the war started, the Bosnian Serbs were driven out of most of sarajevo. Theyjust held a couple of neighbourhoods on that flank. Apart from that they were in the surrounding hills, from where they poured down sniper and artillery fire onto the people below. General mladic started a siege that was to last more than three years. And of course those events now form a central part of the indictments against him. From the beginning of the conflict, mladic brought to bear the serb armys superiority in artillery. So, you had come out of the flat that morning . Mia karamehic was a seven year old living on this street. How did the vibe change in the war . It must have been a big, big change. It was a shock. The siege had just started and she was brought out by a rumour of ice cream. We heard this extremely loud whistle, and suddenly the earth began to shake. I went flying up in the air. In another few seconds, all hell broke loose. I could see everybody lying on the street. People in pieces, a lot of blood. In those dreadful moments, in which 20 people died, a cameraman captured this fleeting image of mia being carried off. She survived shrapnel wounds. Her mother lost a leg in the blast. Together, the family and neighbours endured the following three years during which, at times, 1000 shells a day would fall on the city. We were submitted to shelling and sniper rifles. No border, no electricity, and no food. So we were like mice in a cage, pretty much. While the world awaits the mladic verdict, the hague process has gone on for so long that some convicts have done their time in european prisons they could choose where and been released. A few years ago, jubilant crowds turned out to meet Momcilo Krajisnik as he returned. He was the speaker of the Serb Parliament and, having served his punishment, accepts people on his side were also guilty of war crimes. For much of the war, the bosnian serb leadership successfully kept the outside world at bay. Sometimes intimidating un troops, at others firing on or even taking them hostage. Piano music but across in the east of the country, events reached a Tipping Point in the final year of the war. The genocide indictment against general ratko mladic divides his crimes into various phases. The early part of the war around prijedor, north west bosnia. Then the siege of sarajevo in the centre. And then, finally, the enormous catalogue of crimes that took place in this place in 1995. Srebrenica. The un had declared the srebrenica enclave to be a safe area. But in fact, as mladic planned its capture, the dutch un troops who were meant to defend it had been abandoned by their higher commanders. Mladic savoured his triumph, and recalled past defeats of the serbs by the ottoman turks. Srebrenica was overrun, and more than 20,000 frightened muslim women and children crammed into the dutch base. Rob zomer was one of the soldiers there. Still, any time when i walk in this door, a split second, i smell and see the people. Dead people. There is no toilets. Babies. Everything together. You cannot mention how much it was. Thousands of people. As srebrenica fell, one woman gave rob zomer her baby to look after. How desperate must a lady be, when she cares for a young baby, just born. You must protect it, normally. To give to some strange guy, because he has a blue helmet . Because in that moment it was the best thinking for her, to give the best for her baby, for surviving. He passed the child onto medics, and it survived. Mladic guaranteed the women and childrens safe passage. But meanwhile, his troops hunted the men of srebrenica. When captured, they were taken to places like this school. Soon after the war, we visited it, checking reports that men had been held here and shots fired to keep them under control. Our information came from mevludin oric, who went back to the school with us for only the second time. There hed seen mladic personally supervising what was to happen next. The men, already terrified, were packed into trucks and taken to a nearby field, where mass murder began. Mevludin survived by playing dead among the corpses, and at night he escaped over the mountains to government territory. When we came here in 1996, the main mosque had actually been blown up, and the minaret was lying in the street. And its been restored, and over the years, a good many people have come back, muslim people. Not as many as were here before, but a kind of Muslim Bosniak life has been reconstructed in this town. Mevludin oric is haunted by the loss of his father, brother and numerous cousins, and also by the fact that he still recognises serbs around here from those killing fields. In prijedor, where musreta sivac returned after the war, there are also reminders everywhere. Some men who were never convicted, others whove served their sentences, and who she now encounters on the streets. Miroslav kvocka, taking labouring jobs since his return, is unable to leave the past behind or get over what he regards as an injustice. For Momcilo Krajisnik, its pointless quibbling with a sentence hes already served. Hes done with raging against the hague, and today thinks politicians have to leave their sectarian approach behind. This remains a divided country, in which sectarian politicians play on national fears. And for that reason, as the trials end in the hague, the pursuit of war crimes will go on in bosnia itself. Hello there. A lot happening over the next few days, some really cold air waiting in the winds but for the time being its either wet or its windy. Weve got this succession of low pressure waving wiggling weather fronts spilling in across the uk and near those this is where were going to find some particularly wet weather, again billing beginning to arrive off the atlantic by the morning. To the north of that, cold air, to the south, winds picking up and a mild start to wednesday. This is how it looks for the rush hour and for much of southern england it will be dry, the windsor strengthening, very mild, 12 or13 the windsor strengthening, very mild, 12 or 13 to start the day but were likely to find some rain in wales and particularly wet in west wales. In the north west of england the rain arriving in Northern Ireland could be heavy and beginning to push into the south west of scotland. Some wet weather in the far north of scotland but many inbetweener across scotland, it may well be dry for much of the morning. However, wet weather for Northern Ireland, southern scotland, north west england, north west wales, could be 100 millimetres by the end of the day of the Higher Ground and look at the winds picking up ground and look at the winds picking up over the bulk of england and wales. It may will be dry in the south east and east anglia, it will be windy and mild, a chilly air arriving across the northern has of scotland. As we head into the evening the rain continues and gets heavier and more widely, accompanied by squally winds heading eastwards across england and wales and we start to see snow arriving in the north of scotland, maybe even settling at lower levels as well. That temperatures to ease off during the day on thursday. Some sunshine around, there could be bands of showers. Cold air notjust for scotland, Northern Ireland, northern england, still pretty mild in the south and south east in particular. As we head into friday, this could be the last of the areas of low pressure coming in from the south west. Not sure how far north that rain is going to get, the moment it looks like it could be southern england. The last of the mild days here because the colder air in the north and north west continues to sweep southwards just in time for the weekend. Many places may well be dry, seen some sunshine, but there will be showers particularly in the north west. A mixture of rain, sleet and possibly even some snow. Welcome to bbc news, broadcasting to viewers in north america and around the globe. My name is mike embley. Our top stories celebrations across zimbabwe as Robert Mugabe quits as president. His ousted Vice President is set to succeed him. The surprise resignation was made by letter, just as impeachment proceedings were getting started. Were here right at the moment that theyve heard that Robert Mugabe has resigned from the presidency. And you can hear it from zanu pf mp5, from opposition mps, from members of the public whove come here to witness whats happening. Zimba bwes army chief calls for calm and order, as almost four decades of rule come to an end. And one other story