If ARod was stealing signs and giving them to his teammate that would be totally different from tipping the others teams batters on what his teams pitchers were throwing. Stealing signs is frequently the reason a catcher goes out to talk to a pitcher when the other teams runner gets to second base so they can change the signs so the runner can't tip the hitter off. I don't know about hitters in the on deck circle doing it, but Bob Turley was sometimes able to call pitches for the Yankee hitters from the dugout in the 50's and 60's. So I don't know if that is consdiered so bad, and anyway Teixeira denied it and made a point of telling the media it did not happen. As far as I know Teixeira is considered a credible person.