The fact is, Hauser volunteered to become Doug Quaid.
5 seconds sound clip from the Total Recall (1990) movie soundboard.
You can hear this line at 01:25:33 in the Blu-ray version of the movie.
Quote context
[...]
- So Hauser and I sat down and invented you, the perfect mole.
- That's what we wanted you to think.
- The fact is, Hauser volunteered to become Doug Quaid.
- It was the only way to fool the psychics.
- This idiot here has been trying to kill me ever since I went to Recall.
- You don't kill somebody you're trying to plant.
[...]