My physician does that test when he checks my prostate, I’ve had three colonoscopies and should have another one in a year or so. No brainer.
A colonoscopy is different than a prostrate exam. It sounds like you are confusing the two.
A prostate exam is the finger up your ass and is a common part of annual physicals once you reach a certain age.
A colonoscopy is usually done in a hospital by a proctologist. You drink a ton of miralax and clean yourself out. And then they put you under and they run a scope up your ass.