From another DIYer. These things (trap evaporation) hold true for your tub and commode as well if they're not used frequently. Could also be a bad gasket on the commode unless you're sure it's the sink. Older style floor drains are notorious for this.
Sounds like the plumbing inspectors are not doing their job there if the hardware store has heard this before as BDog said.
Maybe time for TV to hire a new plumber.
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