Even the guy knew there was a process for verifying the check, rather than accusing your customer of fraud upfront. Could have contacted the organization/name that issued the check that's written on the check itself to verify its legitimacy, could have recorded state-issued ID information for the person trying to deposit it (I get ID checked every single time I do anything at the bank), then just fucking tried to deposit it for the man. If it bounced or failed to clear, then you have all the evidence you need to hand over to law enforcement and make a case for charges later. Guy got arrested before any real criminal activity could be verified (and that's obviously why this is news).
But nope, guy isn't a socially accepted white ethnicity, so it's on-the-spot fraud trying to deposit a check that large. Wonder if they even bothered to ask him how he came to be in possession of the check, or if they just saw the amount and immediately mentally constructed a scenario where he was a criminal.