Blac Chyna: Ecstasy Got Her Busted for Drugs

Blac Chyna was arrested for drug possession after cops found 2 ecstasy pills in her purse ... TMZ has learned.

Law enforcement tells us, after Chyna was busted Friday at Austin International Airport for being drunk and disorderly, cops searched her purse and found 2 small white pills with gold glittered flecks in a sunglasses case.

The pills had imprints on both sides, which is a telltale sign of ecstasy. Cops field tested the drug and it came back as MDMA -- commonly known as ecstasy.

As for Chyna's conduct at the airport, according to the police report obtained by TMZ, she became "verbally aggressive to a bartender ... who then would not serve her the amount of alcohol she wanted."

The report says Chyna became "passively resistive," letting her body become dead weight and refusing to walk.