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Smart locks from Chirp systems found to store app credentials in plain text
(krebsonsecurity.com)
This is a most excellent place for technology news and articles.
If the locks really are exploitable, and if the landlord is aware of the vulnerability -- and my guess is that the landlord may have no idea whether or not the things are vulnerable or how much to trust the guy, dunno what the bar is -- it sounds like they might have liability if someone commits a crime using the lock exploit.
https://www.justia.com/real-estate/landlord-tenant/information-for-landlords/liability-for-criminal-activity/
That doesn't give specific state laws, but it does sound like there's at least potential liability issues.