Does the U.S. Attorney's Office investigate crimes? Texas

[qacrawler]

Investigations are generally conducted by federal law enforcement agencies such as the Federal Bureau of Investigation, Drug Enforcement Administration, Customs and Border Protection, Internal Revenue Service, Postal Service, Immigration and Naturalization Service, and others. We also frequently take cases from state and local agencies. The U.S. Attorney's Office works with those agencies to provide direction and legal counsel in federal criminal investigations.

[PublicServant409]

When one of those agencies are tipped off to a crime, how long does the average investigation take? Does the initial complainant generally get informed of the result of said investigation?