There is a sex tape from these events? The only video I'm aware of is when she was "interviewed" for lack of a better term on the porch of the house party where she seems sober enough and claims to be 18. Obviously, people who were sober earlier in the evening could be too drunk to give consent later in the evening through continual consumption of alcohol and controlled substances.
EDIT: read the article and there is a lot of video evidence indicating exactly what Doc said.