How do i make a gun unable to do friendly damage? [closed]

the title says it all, i have this damage script:

local function playerCheck(hit, plyr)
    local playerTouched = hit.Parent.Name
    local playerTouched2 = players:FindFirstChild(playerTouched)
    local humanoid = hit.Parent:FindFirstChild("Humanoid")
    local plyr = game.Players:GetPlayerFromCharacter(hit.Parent)
    if humanoid and humanoid.Parent.Name ~= bullet.Attacker.Value then
        humanoid:TakeDamage(33.5)
        bullet:Destroy()
    elseif not hit.Parent:FindFirstChild("Humanoid") and hit.Name ~= "Handle" and 
        hit.Parent.Name  ~= bullet.Attacker.Value then
        bullet:Destroy()
    end
end
bullet.Touched:Connect(playerCheck)

And i have some teams so how do i make players of the same team get damaged?