The New York Jets claimed they knew Matthew Stafford's signals after they intercepted him four times on Monday night.
"We were calling out their plays as he was getting up to the line," linebacker Darron Lee said.
"We knew his signals. We knew everything. That's just preparation as a defense. ... It seemed like we were in his head as a defense."
The Jets said they weren't stealing signals, attributing the success to thorough preparation and scouting.
They defeated the Detroit Lions 48-17 at Ford Field.