How can you verify the validity of a check before depositing it?

To verify the validity of a check before depositing it, you can start by checking for basic details such as the date, signature, and the presence of watermarks or other security features. Contact the bank that issued the check using a verified phone number (not one on the check) to confirm that the account is active and has sufficient funds. Additionally, you can look for any signs of alterations or inconsistencies in the check's formatting or information. Lastly, consider using a check verification service that evaluates the check against databases of known fraudulent checks.