One thing I know about sociopathic liars is that they can put on a good act of remorse or sorrow....like OJ...they can put on the pitiful "feel sorry for me" act and manipulate people so well it's believable. That's why people keep going back and trusting them when they know they've been burned so many times. "I swear, this time I'm telling the truth...I've been such a jerk in the past but now I'm coming clean"...all the while, they are still playing their lying game.
Good enough for the makings of a confession as far as I'm concerned.
Looks like he may well be arrested this week, per Rita's report. If she's correct, then LE has test results, enough to arrest him with and/or a body.