Bizarre that cops can just decline to give a DNA sample. I feel like it should be mandatory as soon as you're employed for a sample to be taken and filed just to help if a crime scene is contaminated, plus it might be a deterrent for murderous predators like this.
Cop accused of grooming & raping 15 year old
https://x.com/poppy_haze/status/1805584852072177850
https://www.nbcboston.com/news/local/stoughton-police-sandra-birchmore-update/3408067/