Here's one where an armrest of a chair was swabbed at the police station.

https://www.policeone.com/legal/articles/8691418-How-surrept...

I watch a lot of true stories about how crimes are solved and this does happen though not a lot.

Sometimes police tail a suspect and wait until they leave their DNA somewhere, like if they drop a cigarette butt on the ground or if they throw a drink cup away.