Because I think it's very likely based on her statements and the documented history of how police departments deal with rape. It's not based on nothing like Meier falsely claimed.
I said there was nothing to indicate it PROBABLY happened. That was your conjecture. Here is info from the report btw:
Winston, Casher and Darby went to Potbelly's and arrived around 11:00 pm. While at the bar, a blonde female began speaking with Winston.
As Winston Casher and Darby left, the blonde female got into the cab with them (according to Casher, she invited herself). The statements indicated the female was not intoxicated and was able to carry on a conversation.
When they arrived at their apartment, the female followed Winston into his bedroom.
The door was pulled closed but was partially open because it was broken.
Casher and Darby watched as the female performed oral sex on Winston through Winston's broken bedroom door. They then saw the female and Winston engage in oral sex. As a joke Casher went into the room. In response the female told him to get out. She then got up and closed the door and turned off the lights. According to the statements, there were no indications that the female was not a willing participant.
Approximately 20 minutes later the female left with Winston on his scooter. ASA Cappleman asked that we attempt to re-interview the victim and her friends. She also asked that we interview Casher and Darby as well. It should be noted that Casher was not initially interviewed due to the fact the victim advised she was familiar with him and did not believe he was present when the incident took place. Additionally, Casher did not meet the description the victim provided for the subject who she said entered the room.
More info from Casher's statements:
Once back at their apartment (Casher and Winston were roommates), the female and Winston went into Winston's bedroom. After about 10 minutes Casher and Darby peeked in the room and saw the fem.ale performing oral sex on Winston. Casher stated the door to Winston's room was broken and did not latch closed. A few minutes later he watched as the female and Winston removed their own clothing and climbed on the bed and began to engage in sexual activity. Casher stated he went into the room to see if the female would engage in sexual activity with him as well (as has happened with other females he and Winston have brought back to their apartment); however, the female saw him and told him to get out. A little while later, Casher stated he tried to video tape Winston and the female; however, when the female saw him she again told him to leave. The female then turned off the light and went with Winston into the bathroom. Casher stated a little while later he heard Winston and the female leave and get on Winston's scooter. Casher's statements during the interview were consistent with the statement provided to the police by Attorney Jansen. The only discrepancy was when Casher stated he went into the room to surprise Winston. When asked about this discrepancy, Casher stated he did indeed go into the room to try to have sex with her as well.