A Jefferson County teacher picked the wrong example when he used as­sassinating President Bar­ack Obama as a way to teach angles to his geome­try students.

Someone alerted autho­rities and the Corner High School math teacher was questioned by the Secret Service, but was not taken into custody or charged with any crime.

"We did not find a credible threat," said Roy Sex­ton, special agent in charge of Birmingham's Secret Service office. "As far as the Secret Service is concerned, we looked into it, we talked to the gentleman and we have closed our investigation."