Castle, Season 6

[Beckett broke into a warehouse and found a car with blood on the passenger's seat]

Beckett:
You killed Jason Marks and the blood in the car is gonna prove it!

Simmons:
Well, then that's a good thing you have a warrant - You do have a warrant, don't you Detective? [Beckett not answering] Aww, I see, that's a shame, because now aaall that evidence has become fruit of the poisoned tree. My lawyers and I thank you!