Well, he might be a cop. I don't know. We're checking on that.

5 seconds sound clip from the Die Hard (1988) movie soundboard.

You can hear this line at 01:32:33 in the Blu-ray version of the movie.

Quote context

[...]

- Aren't you forgetting something?

- Such as?

- What about John McClane?

- He's the reason why we have the information we have up until now.

- He's also the reason why you're facing seven terrorists instead of 12.

- He's inside? Who is he?

- Well, he might be a cop. I don't know. We're checking on that.

- One of yours?

- No. No way.

- Do you smoke?

- Yeah.

- Thanks. (3)

- You don't work for Nakatomi.

[...]