I wouldn't put him in solitary. Put him on a general open wing. Even inside there are hardened criminals who won't stand for this. They see getting caught as part of the risk, and yes they do 'hate coppers' but most would not want to see two unarmed young women, or men for that matter, gunned down in cold blood. They would treat him like a disease and try to take him out. Solitary will just give him protection.