Wonder why cops touch your car when they stop you.
The second issue they mention about checking who is in back is something that happened here, as the Officer walked up (he stopped a truck with gang members)
https://www.clickorlando.com/traffic/2020/02/07/heres-why-officers-touch-the-back-of-your-car-during-a-traffic-stop/
Here’s why officers touch the back of your car during a traffic stop