a pit bull, and is standing guard of an unarmed young lady with her hands on the back of the car with an asp in one hand and a pit bull in the other. reporter: when state troopers arrived they determined justice was not a police officer and called jefferson parish deputies. deputies searched his car and found an arsenal of weapons including a rifle, shotgun, assault weapons, knives, and 446 rounds of live ammunition. a police officer is not going to pull his gun out on a traffic stop. he is going to walk up to the car cautiously. reporter: wdsu crime and safety expert howard robertson says there are signs to look for to help you distinguish between an officer and an impersonator. uniform or not, every officer has three forms of i.d. on them a badge to where so you can see it, i.d. card, and formal i.d. if an unmarked car is signaling you to pull over robertson says stop in a well lit area and call 911. if it s not a marked car and