12, OP didn't say it was on their clothes - they said shoes. Unless they're cloth shoes, it's do-able. Though, I can understand not wanting to have to wipe someone else's pee off your shoes. Gross, gross all around, both options are just. . . gross.

He never mentioned he worked at a place with a very strict dress code, so he could work somewhere where tennis shoes are allowed, which can soak up liquids easily

Even if they were industrial shoes, if liquid gets inside you've got a puddle of urine in your shoe. I wear doc martens when's it's raining and water can still get in