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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.

In text messages, the prosecution says were sent from Bongolan to Cassie, Bongolan says she's going to stop by Cassie's location in a few minutes to drop something off -- later telling her she's outside. Gallery Launch Gallery

About 30 minutes later, Cassie texts Bryana, "he wanted me to ask if ur sure that's moly bc it didn't taste like anything."

Bryana calls the substance "moon rocks" and sends a picture of a crushed-up pink powder next to a dime coin ... writing she "took a dot just

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