In the documents obtained by ET on Monday, police say they located "two small white pills with gold glittered flecks" in a sunglasses case when they searched the 27-year-old model's purse. After Chyna -- whose real name is Angela Renee White -- said she did not know what the pills were, the affidavit states the pills were field tested and came back positive for "Methylenedioxy Methamphetamine, commonly known as ecstasy, MDMA and MDM."
Chyna was arrested at Austin-Bergstrom International Airport on Friday evening during her layover while she was en route to London. Law enforcement confirmed to ET that the call came in for "an intoxicated individual on a plane causing a disturbance." She was charged with public intoxication and possession of a controlled substance, more than one gram but less than four grams.
However, the arrest affidavit states British Airlines refused to even board her due to her alleged intoxication status, police reporting that she smelled like alcohol prior to her arrest and that a British Airlines manager stated she was "verbally aggressive" towards him. Police say that when the model eventually returned to the airport bar to continue to drink, she caused another disturbance when the bartender refused to serve her the amount of alcohol she requested. The bartender also stated that she had talked about taking Xanax while sitting at the bar, the documents state. Chyna allegedly then cried and answered "of course" when asked if she had been drinking, and said she had no family or friends in the area to pick her up to be responsible for her welfare.
She later refused to walk and was "not cooperative," police say.
According to TMZ, Chyna was eventually picked up by her boyfriend, 28-year-old Rob Kardashian. Rob reportedly drove his Bentley all the way from Los Angeles to Austin to retrieve Chyna, driving 26 hours.
Meanwhile, the situation between the Kardashian family and Chyna appears to remain tense. Rob's 31-year-old sister, Khloe Kardashian, seemingly made a snarky reference to the model's arrest on Friday, tweeting, "Damn!! On a Friday kid!!!"
Though some Twitter users were quick to point out Khloe's own arrest in March 2007 for driving under the influence, for which she served less than three hours in jail due to overcrowding.
Last week, a source close to Rob told ET that the Kardashian family was worried about Rob's "fragile" state, even though some felt "betrayed" about his headline-making new relationship. Chyna has various ties to the Kardashian family -- the "Rack City" music video star used to be close friends with Kim Kardashian, but the friendship cooled after Kim's 18-year-old sister, Kylie Jenner, started dating 26-year-old rapper Tyga. Tyga is Blac Chyna's ex-fiance, and the two have a 3-year-old son together, King Cairo.
"Yes, Kylie feels betrayed, but she also doesn't see the need to publicly taunt him," the source said. " ... The fear is that Chyna is doing this for attention."
Kris kept a low profile, dressed in black and covering her face with oversized sunglasses, while driving to the model's gated home just before 10 a.m. on Friday morning. An eyewitness told ET that Kris pulled up to the gate, where a security guard announced her arrival and sent her through, with Kris looking serious and very focused.