> If a defense attorney did something similar, Williams said, “I guarantee you this DA would try to prosecute that defense attorney.”

Who watches the watchers?

We know now that we need to look for something like a notary stamp and judge signature on a subpeona, but we will never be as sophisticated in this domain as the DA's office, so they can probably easily trick us in other ways. The lesson I am inclined to take from this is to avoid interacting with a DA without a lawyer, similar to an investigator or a "curious" or "friendly" police officer.