Diddy's trial has focused a lot on drugs and drug usage over the past few days ... including when Cassie's friend Bryana Bongolan testified that she previously purchased drugs for her -- and pictures of what appear to be drugs have now been entered into evidence.

As the Sean “Diddy” Combs sex-trafficking trial continues, Bryana Bongolan, a close friend of Combs’s ex-girlfriend Cassie Ventura, took the stand on Wednesday to testify against the music mogul. She said Combs threatened to throw her off Ventura’s 17th floor balcony.