Some early clues have surfaced in the death investigation into what killed Foo Fighters drummer Taylor Hawkins ... investigators say tests show drugs were in his system.
In a release from the Attorney General's Office in Bogotá, Colombia, officials say a toxicology test taken from Hawkin's urine revealed 10 different substances -- including opioids, tricyclic antidepressants and benzodiazepines.
Investigators say they will continue to work on Hawkins' case ... but obviously, the drug test is telling.
A post from the Foo Fighters read, "The Foo Fighters family is devastated by the tragic and untimely loss of our beloved Taylor Hawkins. His musical spirit and infectious laughter will live on with all of us forever."