It's a known risk, and there are guidelines to lessen or prevent lead exposure at the range, but I'd wager most shooters aren't aware.
For example:
Use jacketed or lead free bullets and primers.
Wash your face, arms and hands after using the range.
Change your clothes and shoes after using the range.
Wash your range clothes separately from your families.
Do not eat, drink, or smoke on the range.
Take the same precautions after cleaning your guns.
That being said, the folks at largest risk for this kind of exposure would be those who fire guns the most often, so that population would be the canary in the coal mine so to speak.
https://www.quora.com/How-often-do-police-officers-practice-at-ranges
"How often do police officers practice at ranges?
Most departments require re-qualification training once a year.
My department required shooting three times a year, once with our sidearm, once with our 12 gauge shotguns, and once with our AR 15 carbines.
As for my self, I go to the range 8 to 10 times a year. I am usually accompanied by 5 or 6 of my fellow officers. We are not for the fun, we are training by using the state required shooting plans and we add a little extra to it.
Most officers I know only go to range when required for re-qualification. Not because they don’t want to, shooting off a couple hundreds rounds is an expensive proposition."
Yeah... Might be a reason cops seem dumber than average, and they don't hire the brightest to begin with.
https://abcnews.go.com/US/court-oks-barring-high-iqs-cops/story?id=95836