How do I determine if a banknote is genuine? What should I do if I think I have a counterfeit note? The best way to determine whether a note is genuine is to rely on the security features, such as the watermark and security thread. Counterfeit detection pens are not always accurate and may give you false results. To learn about these and other security features in genuine Federal Reserve notes, visit the U.S. Currency Education Program website.

It is important to know what the security features are in genuine currency, because if you end up with a counterfeit note, you will lose that money. A counterfeit note cannot be exchanged for a genuine one, and it is illegal to knowingly pass counterfeit currency.

If you live in the United States and you think you've received a counterfeit note, immediately notify the local police. Try to remember the physical characteristics of the person who passed the suspect counterfeit, and if possible write down the person's license plate number and vehicle description. Store the suspect counterfeit apart from genuine currency and release it as soon as possible to law enforcement authorities.

If you live outside the United States and want to report counterfeit currency, you should notify the U.S. Secret Service field office in your region. The Law Enforcement section of our currency education website, www.uscurrency.gov, offers contact information for U.S. Secret Service field offices around the world.

https://www.federalreserve.gov/faqs/currency_12597.htm

Sequel to the just concluded extraordinary meeting held in Washington DC on Nov. 2nd, 2022 between the United States Federal Reserve Bank, Office of the Comptroller of Currency, IMF, World Bank, and Governors of Africa’s Central Banks, the United States Govt has set date for restriction on an acceptable legal tender note of US Dollar which will commence on Jan. 31st, 2023.

The restriction implies that any US Dollar note below the 2021 printed date will no longer be accepted or be a legal tender anywhere in the world… This effort is to curb billions of illegal monies in dollar bills warehoused around the African continent emanating from drug-related, terrorism, kidnapping, and money from corrupt politicians.

As part of the enforcement of the strict action plan, African central banks will be assigned a special agent from the Office of the Comptroller of Currency, Administrator of the National bank United States of America to checkmate all inflows and outflows of dollar transactions.

The report also has it that the US president has also written to British Government and European Union to tour the same line and redesign their currencies accordingly to frustrate those with ill-gotten money in US dollars, British Pound Sterling, and Euros.

https://9newsng.com/breakingany-us-dollar-notes-below-year-2021-will-not-be-acceptable-from-january-2023-says-us-govt/

I suspect this is the opposite if true, that dollars AFTER 2016 edition will be considered 'counterfeit'.