I want to testfor if there is specific player in a specific team

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Its for my adventure map basically an anti-cheat mechanic that makes sure anyone that isn't me can't join the team "Admin"
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How do you test a specific player in Minecraft?
@p (Nearest Player) If a command block has executed the command, the nearest player to the command block will be targeted. If you run a command from the Chat window, the player running the command will be the nearest player.How to testfor a fake player -- MapMaking Tricks
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Images: Andrea Piacquadio, Monstera, Pixabay, Alexander Nadrilyanski