That's what back bumpers are for.

Yes, and what do cars have on their back bumpers?

Some pretty fancy bumper stickers back there.

Captain, I took the paint we found on the back bumper of the victim's car to the print shed, analyzed the color with a fourier transform infrared spectrophotometer.

Okay, a big house in Winter Park, a tall husband who makes a lot at money but is also properly God-fearing, and a pearl white Bentley Continental GT with a pink Jesus fish on the back bumper.