Party Chat not allowed in Modern Warfare 2

While playing Modern Warfare 2 I realized that party chat in many of the game typed is not allowed. I believe this is to prevent cheating if one person in a party gets put on the opposite team as the rest of the party. I can understand this because if one person gets put on the opposite team as the rest of the party, he or she may try to bring the team down to let the rest of the party win.



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