After the carnival last night, I performed an autopsy. The victim didn't die of drowning. There was no water in her lungs.

9 seconds sound clip from the Murders in the Rue Morgue (1932) movie soundboard.

You can hear this line at 00:27:54.348 in the Blu-ray version of the movie.

Quote context

[...]

- You don't live badly here, monsieur.

- I had to hurry myself up here without lunch.

- Oh. And now you have to hurry back for your lunch. Boy, that's too bad. Good appetite to you and your quiet guests. Goodbye.

- Good day, monsieur.

- If you'd pay half as much attention to your studies as you do to this nonsense, what grades you'd get.

- What did you find out?

- After the carnival last night, I performed an autopsy. The victim didn't die of drowning. There was no water in her lungs.

- Oh, so that's what you were up to. I thought you were with Camille.

- Of what did the victim die?

- Here it is again.

- What?

- The same foreign substance in the blood of each victim.

- Look. All three died from the same cause. Some strange poison perhaps.

[...]