why the former officer never should have confused her two weapons. >> i'm right-handed, right hand dominant. i carry my handgun on my right side. i carry my taser on my reaction side. >> so you carried your taser on your left side? >> yes. >> why do you carry it on the other side? >> that's how the policy has always been, and that's how we've always been trained. >> reporter: and these still images introduced in court on tuesday show potter's holster was set up the same way for years. >> ms. potter got 100% on that test, correct? >> yes. >> reporter: and with decades of training dating back to 2002, when potter received her initial certification on the taser. >> so this is ms. potter being certified again in 2015? >> yes. >> it appears a score of 50 out of 50 on this. >> reporter: the jury seeing for the first time on monday a clear shot of the actual gun used by potter and the taser she thought she pulled from her left side. >> when i refer to a reaction hand draw, the taser would be