We found a snake contained by our bathroom this morning could it enjoy come from the tub drain,toilet or nouns vent?
Possible nouns vent. My first thought is openings around pipes such as below sinks, behind wash machine, etc.. You most possible have an hole that they are going through and not FROM a drain. Fill contained by all opening around pipes with steel wool; this will also give a hand keep mice out.
Unless that breed of snake is competent to access plumbing that may usually be filled next to water at some point, it's unlikely.
You don't detail the size of it, but it's doubtful a smake of any size would gain access through a toilet, and if the tub have a drain catch within it, that could stop a large adequate snake. The vent is the most likely of the 3 you mention, but the snake could own gained access anywhere and gravitated to the bathroom for cool, and wet access. Many Snakes can drown.
I keep Corn Snakes, and they will coil and settle contained by their water bowl, but that's to adjust their ambient temps. and drink. They are not a breed that submerges.
Just my two "sense"
Answers: I think your cross-examine is fairly answered. We sometimes hold rat snakes (called chicken snakes) in our old-fashioned farm home. They are usually within the broom closet on the porch. They are after mice which I hate so I evacuate the snakes alone and let them do their available job. However, I remove poisonous snakes in the patio to the woods nearby. Snakes hold a place in this world too. Good luck.