There's not a hip-hop artist that didn't snatch of piece of Bob Marley. It's totally impossible.
They prospect of seeing oneself in the mirror clean-shaven is too close to a Vincent Price film... a prospect not to be contemplated, no matter the compensation.
Because interrogations are intended to coerce confessions, interrogators feel themselves justified in using their coercive means. Consistency regarding the technique is not important; inducing anxiety and fear is the point.