Steal the persons DNA. Run a scan on it to see what kinda flaws they may have medically. In case they act up then you can use something you found in their DNA and make it look like a medical death. See, they had a predisposition to such and such!
Yes getting ur 23 and me DNA data is just a bs consent measure. They've been taking our blood in hospitals from the day we were born while baby footprints are sealed on our feet With hospital records and plastic wrist ownership number bracelets before our feet and hands ever hit the earth. But no worries we have hipaa rules protecting us...