[Bobblehead]

All teams know their signals are being stolen. That is why guys cut from one team are picked up by an opposing team.

As long as they are doing it by human observation, there is no issue. Indeed, you can't make rules telling people they can't watch the other team or remember what they did; that would be just inane.

But when teams start filming sidelines and can rewind to look for patterns, then the technology is doing the work. People seeing and remember, great; machines doing the seeing and remembering, bad.

Edit: Take a look a Peter King's Monday Morning QB - Ten Things I Think, #3

"It's the most overrated thing in sports,'' said Peyton Manning, who went on to give me a great example of how a foreign agent can actually hurt a team's preparation. "The classic was when we're playing Cleveland and they got [former Colts backup quarterback and offensive assistant] Kelly Holcomb and Bruce Arians. It's Tony Dungy's first year, maybe 2002. So the Browns grill Holcomb all week, 'You got to give us something' and he says, 'I'm telling you, Peyton's going to change it up. He knows I'm here, he's going to give you a dummy audible early. I'm telling you, he's not stupid. So, just play your keys.'

"They're up 16-3, I think, at the half," said Manning. "Second half, we get a good drive going and it's fourth-and-three. So we run our bread and butter play, a little five-yard under route. Well, I signal the play and Holcomb -- it's the same signal -- so he says, 'Ah, now I'm going to help them.' So he says, 'They're running the five-yard under play! Five-yard under play!"

"And so you can see it on the film -- they're going, 'Watch the slants, watch the slants.' So they load up, all inside technique, and they go into a man defense. Well, I see this and I see the defenders all change up -- that's the thing about the no-huddle, I can see this -- and I kept the receivers doing the same thing and I checked to a zone running play and it's only six guys who gotta know -- the linemen and the back [James Mungro]. And he goes 29 yards untouched for a touchdown. And so their guys go to Holcomb, all pissed off, 'So, they're running a slant, huh? Thanks a freaking lot, Holcomb.'