He figured that he could get an alien back through quarantine if one of us was impregnated... whatever you call it... and then frozen for the trip home.
15 seconds sound clip from the Aliens (1986) movie soundboard.
You can hear this line at 01:51:50 in the Blu-ray version of the movie.
Quote context
[...]
- Hudson?
- Yeah. All clear. Nailed the other one. It's history, man.
- I say we grease this rat-fuck son of a bitch right now.
- Just doesn't make any goddamn sense.
- Nobody would know about the embryos we were carrying me and Newt.
- Wait a minute, now. We'd all know.
- Yes. The only way he could do it is if he sabotaged certain freezers on the way home. Namely yours.
- Then he could jettison the bodies and make up any story he liked.
[...]