Did you know that it was forensic handwriting analysis that was key evidence in bringing down the Chicago gangster Al Capone?  Federal Treasury Agents worked to gather evidence that Capone failed to pay his income taxes.  Bureau of Revenue investigator Frank Wilson discovered that Capone did not maintain a bank account and never signed any checks or receipts.  Although Capone lived a lavish lifestyle there was no evidence that he had any income.  A key witness against him was a handwriting expert who compared handwriting on a ledger with that on deposit slips tying Capone to monthly income from a gambling hall. With this evidence they were able to convict Al Capone of income tax evasion and finally send him to prison.