'Making A Murderer': Defense Lawyer ... I Screwed Up Brendan Dassey's Police Interview

The lawyer who represented Brendan Dassey says he messed up by allowing his client to meet with cops when he wasn't present, and the reason he was a no show is shocking.

Len Kachinsky appeared on "TMZ Live" Tuesday and had a hard time explaining why his PI strong-armed his 16-year-old client into signing a murder confession. He had an even harder time explaining why he then gave his client up to the cops.