Just wait for the secondary lawsuits, or has no one thought of that. Given how prevalent it is these days to lose a job or a job-related credential (security clearance, license to practice, drivers license) due to a DUI...as soon as those convictions get overturned, I bet you are going to see a TON of lawsuits (naming city, and individual officers, as wouldn't dereliction of job responsibility make one negligently responsible for the effects) for financial loss...and look at the burden of proof--you can now EASILY prove the error and the party responsible, AND easily prove damages (since it is legal to remove a credential or fire someone if their contract deals with DUIs)...hello class action...or better yet, individual cases.
And the best part, all the evidence needed is already provided!