So I will take that as a no, you cannot cite a single case. Not a single one that has made the news? Not one in the 5,820 threads in this part of the forum? Just "trust me bro".
I have not seen a single case on the forum,
ever, of someone giving false or no details who has been tracked down by a ticket and/or bodycam and then sent a letter.
We do not live in a panopticon. My mum could travel on a ticket her friend Mrs Smith bought, be liable for a Penalty Fare, and give false details, get away with it at the time and there is nothing you could do about it. You have no idea who my mum is or what she looks like, or Mrs Smith for that matter. The bodycam wouldn't be helpful in that sort of case. Northern recently had to release details of all their prosecutions under FOI; a very eclectic mix! As well as all the fares offences, they successfully prosecuted people for littering, transferring tickets, being unfit to be on the railway, disorderly behaviour - all sorts. They prosecuted under 25 different Bylaws. But not a single solitary case even
attempted under Bylaw 23 for refusing to give details or giving false details. Not one! And we know that offence is committed all the time; barely a week goes by without someone saying they are shocked to get a letter where someone else gave their details.
There is an epidemic of people giving the details of other people they know. Here is the latest, from last week:
https://www.railforums.co.uk/threads/letter-reporting-dependant-for-non-payment-of-fare.268071/ Essentially the passenger writes back saying "it wasn't me", and that is that, the case is closed. There is nothing else that can be done.
This is why stopping people and collecting their details, and taking steps to verify those details, is important. Else you wouldn't bother to do it, and you wouldn't have access to verification tools like the credit reference agencies and the electoral roll, and it wouldn't be an offence for a passenger to refuse to give their name and address. You'd just scan all the tickets and let the guys in the back office take over. Except that doesn't happen. If it did, the TOC revenue protection teams would be all over it with their PR. However there has been not a peep and not a single example has surfaced of this ever happening other than "trust me bro".
Where CCTV and bodycams are useful are where habitual and hardened fraudsters, whose identities and likeness are known, are being tracked with a view to catching them in a sting. Building up patterns of behaviour, showing extended patterns of fraud, and with a view to handing that stuff to the police, who can arrest the suspect and conclusively identify them prior to any court summons being issued. Or, perhaps a staff member has been assaulted or a disorderly conduct Bylaw has been breached. Bodycams are great for that. But you'd still need to actually identify the passenger.
if you can find an example of someone who gives false details, escapes, but who then retrospectively gets taken to court because the retailer divulged the purchaser's info then please do link it here.