How to avoid mass duplicate tools for this script and only give when required?

How do I make it so if it finds "TechModel" have the tool, then it won't execute the script again because I get duplicates sometimes when I reset? If I don't have the tool, then it passes through and gives me the tools.

I did try

if players[i] == plr.Name and plr.BackPack("tool") then return

but it doesn't sound right and doesn't make sense.

local players = {"TechModel"}
local tool = script["The Rocket"]
local car = script.LimboJimbo

game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(chr)
        for i = 1, #players do
            if players[i] == plr.Name then
                tool:Clone().Parent = plr:WaitForChild("Backpack")
                LimboJimbo:Clone().Parent = plr:WaitForChild("Backpack")
            end
        end
    end)
end)