The Salt Lake Valley Health Department has weighed in on the Crypto problem, and they have a slightly different take on the State's rule:
Any child under three years old, any child not toilet trained, and anyone who lacks control of defecation shall wear a water resistant swim diaper and waterproof swimwear. Swim diapers and waterproof swimwear shall have waist and leg openings fitted such that they are in contact with the waist or leg around the entire circumference.
I don't remember reading anything about "under three" in the Utah State rule, but if I operated a public pool in Salt Lake County (Heaven forbid), I wouldn't look any further. I'd post that, and hope to be done with it until Labor Day.
Besides the three year old restriction, doesn't "anyone who lacks control of defecation" sound better than "those who cannot control evacuative bodily functions"?
Er, on second thought, maybe not.