Herald on Sunday letters: Scotland needs to follow the psychological science if is to win the Covid battle Herald on Sunday letters: Scotland needs to follow the psychological science if is to win the Covid battle I WAS impressed by Helen McArdle's pointed article on the deficiencies of our self-isolation/quarantine system in contrast to those of many other countries and the crucial role these have played in the level of infection ("How Scotland’s ‘tougher’ quarantine hotels may restrict travel to England for months to come", January 31). There is more to be said. I recently had the misfortune to find myself in South Africa amidst the growing concern about the coronavirus variant. On flying back to Glasgow, I was relieved that PCR testing for returnees had belatedly been put in place, together with improved passenger locator procedures. I was duly contacted inside 24 hours by a pleasant woman who went through the protocol for self-isolation with me. What struck me forcibly, however, was its failure to "follow the science": specifically the psychological science.