She must have used a pass key.
4 seconds sound clip from the Fear and Loathing in Las Vegas movie soundboard.
You can hear this line at 01:35:57 in the Blu-ray version of the movie.
Quote context
[...]
- Who is that? Oh. Shit, that's me.
- Help me!
- She must have used a pass key.
- I was polishing my shoes in the closet when I noticed her sneaking in, so I took her.
- What made you do it? Who paid you off?
- Bullshit! You're just as much a part of it as they are.
- The goddamn dope ring. You must know what's going on in this hotel.
- Why do you think we're here?
[...]