Just came across a fake bill at work (a $1 bill of all things). It

See where ripped, damaged money goes to die — and what they do with it - Washington Post

4 Ways to Detect Counterfeit US Money - wikiHow

Everything You Need to Know About Counterfeit Detector Pens - Drimark

Counterfeit bills: what to do detect, look for in fake currency

1934 $20 Bill Value: Series, History, Rare Errors & Worth

Fake bill that was confiscated at work today : r/papermoney

United States currency/$5 bill - Wikiversity

3 Ways to Check if a 1 Dollar Bill Is Real - wikiHow

Counterfeit Investigations