Bunk
After reading all the replies I still think it is bogus that critters of any kind crawl all the way up the sewer system and out your drain. That is a very long path with flowing water at the street to overcome. NO WAY!
Even if the water in the traps evaporated, that is still a long pipe to travel up from the street with water flowing from other houses.
It is like believing in ESP or flat earth.
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