How can I make my script end?

this script allows you to place an item on the ground when you click on a button, then the ground, but I want the script to be completed when the item is placed on the ground. Instead, if i re-forage the item it automatically allows me to place it again which i don't want. It seems like the script is still "open" in a way if that makes sense. What I'm trying to figure out is how to make the script completely end so that you have to press the button again to place the item again. Let me know if you need me to clarify anything. Thanks!

local BUTTON = script.Parent
local player = game.Players.LocalPlayer
local CURRENT = nil
local mouse = player:GetMouse()
local RANGE = 15


function do_remove_all(parent)
    local children = parent:GetChildren()

    for index, child in pairs(children) do
        child:remove()
    end
end

function rangeCheck(mouse)
    local char = player.Character
    local torso = char.Torso

    return (torso.Position - mouse.hit.p).magnitude < RANGE
end



function removeExample()
    local player = game.Players.LocalPlayer
    local char = player.Character

    local ex_check = char:findFirstChild("BACKPACK_EXAMPLE")

    if ex_check ~= nil then
        ex_check:remove()
    end
end


function onMouseMove(mouse)
    local player = game.Players.LocalPlayer
    local char = player.Character
    local torso = char.Torso
    local pack = player:findFirstChild("Pack")
local pack_tab = pack:GetChildren()
local partname = BUTTON.Text
local part = pack:FindFirstChild(partname)

    removeExample()


        if rangeCheck(mouse) then

            local example = part:Clone()
            example.Name = "BACKPACK_EXAMPLE"
            example.Locked = true
            example.Transparency = 0.5
            example.Parent = char
            example.Position = mouse.hit.p
            do_remove_all(example)

        end
    end


function onButton1Down(mouse)
    local pack = player:findFirstChild("Pack")
local pack_tab = pack:GetChildren()
local partname = BUTTON.Text
local part = pack:FindFirstChild(partname)
local player = game.Players.LocalPlayer
local char = player.Character

    if part ~= nil then
        if rangeCheck(mouse) then
            print("clicked")

            part.Parent = game.Workspace
            part.Locked = false
            part.Anchored = false
            part.Position = mouse.hit.p

            removeExample()
            part = nil
    end
    end
    end

function onKeyDown(key, mouse)
    if key == "r" then
        removeExample()
        local CURRENT = nil
    elseif key == "e" then
        local player = game.Players.LocalPlayer
        local pack = player:findFirstChild("Pack")
        local pack_tab = pack:GetChildren()

        for index, child in pairs(pack_tab) do
            local CURRENT = child
            onButton1Down(mouse)
            wait(0.1)
        end

        local CURRENT = nil
    end
end

function onMouseButton1Down()

        print("buttonclicked")
    mouse.Button1Down:connect(function() onButton1Down(mouse) end)
    mouse.Move:connect(function() onMouseMove(mouse) end)
    mouse.KeyDown:connect(function(key) onKeyDown(key, mouse) end)

end

BUTTON.MouseButton1Down:connect(onMouseButton1Down)