public OnClientPutInServer(client)
{
    SDKHook(client, SDKHook_WeaponCanUse, OnWeaponCanUse);
}

public Action:OnWeaponCanUse(client, weapon)
{
    if(GetClientTeam(client) == 3)
    {
        return Plugin_Continue;
    }
    return Plugin_Handled;
}