(As with many social ills, it's likely a very small number of repeat offenders – so identifying & appropriate addressing them in a prioritized manner is the best way to a solution.)
Or, just use the less expensive option to deploy nanny state level camera coverage and use the facial recognition to identify the dog's owner so the bills can be sent out by some AI system purchased from Amazon. Your fines will be delivered in 48 hours for free or possibly the same day if they have a facial recognition data center in your local area.
The link to download the 311 reporting app for Android and iOS are on the right side of page when viewed on a desktop, not sure how it looks on mobile however the link should still be there.
https://www.cnbc.com/2018/12/19/pooprints-brings-in-millions...
(As with many social ills, it's likely a very small number of repeat offenders – so identifying & appropriate addressing them in a prioritized manner is the best way to a solution.)