A Knoxville woman is in custody after police said she threatened to blow up Bradford Health Services.

Police arrested Valerie Tollett Saturday after she threatened to blow up the medical facility if she failed her drug test.

A witness said she overheard Tollett saying she needed dynamite, a knife and a bulldozer, according to investigators.

Police said a bomb sniffing K-9 was brought in to Bradford Health Services and nothing suspicious was found.

Police said Tollett made the threat almost a month ago.