I interpreted the "can't determine when it was downloaded" to mean that the time stamp, file location, or other metadata either implied another user downloaded/copied it, or ruled him out as the downloader. If they were to plant a file, I would think they would match the times stamp, etc., to clearly implicate Gartenlaub (assuming minimal competency, which could be where my expectations diverge from reality).
IANAL, but isn't restraining someone and keeping them in a place against their will without any legal justification also known as kidnapping? I believe that's a felony. And he's plotting this kidnapping across state lines, which would make it a violation of federal law.
So are SF Police recruits going to be issued double-barreled shotguns to help enforce this rule? Thus they will be forced to reload as they reassess.
The article does mention that the two bullet rule and the two hour training are for recruits, implying that more experienced officers may still fire freely and without the constraints of de-escalation tactics clouding their judgement.
"Another new policy demands that all sworn officers take an additional eight-hour class on how to handle suspects with blades and other non-firearm weapons."
I'm assuming this is aka target practice, even if that's the opposite of the stated purpose.