If You Had Been Shopping One Day And Upon Returning Home Noticed That You Had Been Passed A Counterfiet $20 (US Currency) But Had No Idea Who Gave It Too You What Would You Do With It?

I work for a bank - I'd hand it in.

I'd try to pass it off as legal tender. I'm broke man, screw being out $20 bucks because some cashier doesn't do their job.

Well...I would hate to be out $20...but I'd probably call the police & hand it over to them. My bank ? I'm not so sure.....
Years ago I was given a bad bill by my bank when I cashed a paycheck. I caught it right there in the bank & they denied I got it from them. They said I mixed it with my other cash in my wallet & they were not responsible. Too bad. That ticked me off big time.