If he were to claim insanity, this conversation is admissible.

5 seconds sound clip from the Se7en (1995) movie soundboard.

You can hear this line at 01:38:15.991 in the Blu-ray version of the movie.

Quote context

[...]

- I'm not letting this conviction slide. I can tell you that.

- He says that if you do accept under his specific conditions, he will sign a full confession, plead guilty right now.

- It's your case. Make a decision.

- Full confession. I'm in.

- It has to be the both of you.

- If he were to claim insanity, this conversation is admissible.

- The fact that he's blackmailing us with his plea.

- And my client would like to remind you two more are dead. The press would have a field day if they find out the police didn't seem too concerned about finding them. Giving them a proper burial.

- If in fact there are two more dead.

- A lab report came up from downtown. They did a quickie on Doe's clothing and fingernails. They found blood from Doe. From him slicing his fingers.

- Blood from the woman who's face he cut off. And blood from a third party, as yet unidentified.

[...]