I had some luck.
3 seconds sound clip from the Dirty Harry 1 movie soundboard.
You can hear this line at 01:12:19 in the Blu-ray version of the movie.
Quote context
[...]
- Will you come this way, inspector?
- May I bring you in a cup of coffee?
- I'll be done in a minute. Have a seat.
- I've just been looking over your arrest report. A very unusual piece of police work. Really amazing.
- You're lucky I'm not indicting you for assault with intent to commit murder!
- What?
- Does Escobedo ring a bell? Miranda?
- I mean, you must have heard of the 4th Amendment!
[...]