I have always thought it wrong to allow any collection of fluids ........ akin to forcing someone to testify ......... what happened to the 5th Amendment
unfortunately a number of Jurisdictions automatically collect DNA when you are picked up - not sure if DNA is gathered if you are 'detained' or you gave to be arrested
Same thing here. If the DNA is needed for the current investigation then it is a legit search. It's not a legit search if the DNA is being collected for the sole purpose of running through a database.
Point is, the douche bag shouldn't have gotten into a bar fight and killed someone. (allegedly)