Had a much lesser case years ago in which the defendant was charged with a felony. Two prior attorneys told him to plead guilty. He came to me and I noticed 1) that commonwealth made a mistake in the charging documents and 2) under the statute, the defendant had an absolute defense to the charge anyway. The case was tried and the jury found him not guilty based on the defense. The state should never have prosecuted the guy, it was a waste of tax dollars.
Sometimes the Defendant does not even know that he may have a defense when he talks to police. The Police certainly are not going to tell the guy. I don't know the facts, but based on appearances, the guy looks like he belongs in a mental health facility.
In another case I had years ago, involving a ring that was illegally trying to manufacture PCP, in reading about the process, I realized and then confirmed, that the guys screwed up the process and the stuff they made was probably not PCP, but just chemical mush. Fought for 5 months to get a sample for independent testing. Turns out the stuff was not PCP at all. My guy ended up doing a weekend in jail for maintaining a public nuisance as part of the plea deal. He thought he was guilty and was ready to plead guilty. He would have done about 5 years had he plead guilty to the original charge.