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he has never been involved in any incidents (in a negative incident)
Explanation: Other possibilities:
He has never given cause for any complaints. / There have never been any complaints about him.
He has always conducted himself properly (with the utmost propriety/decorum)
Some suggestions. In other words, he's been a good tenant, the cops never had to be called.
(Er ist nie unangenehm aufgefallen would be another way of saying it in German)