This is patently offensive

The Supreme Court of Washington has affirmed a murder conviction that was based in large part by DNA evidence obtained through absolutely appalling trickery, even by cop standards. Trying to close a cold case, the police concocted a ruse to obtain the DNA- they sent the suspect a letter from a fictitious law firm, claiming that he was a class member in a (phony) class action. Naturally, he signed a few documents and licked an envelope.

They got the DNA off the envelope.

This is an outrage! The cops subverted the legal process, claiming to be his attorneys! This is an instance in which bad facts made bad law. The guy was a rapist and murderer, so why let "technicalities" like the Constitution stand in the way.