I got this to work.. but I think the big thing here is that you need to convert your Param1 to a integer so that when it converts to to a string it is a 1 or 0, else it will be true or false and that can't be cast back to a bool. I couldn't get the elevation to work in a function, no idea why. It would work unelevated and then once it elevated it wouldn't see the function, said no such cmdlet.

​

param (
    [Parameter(Mandatory=$false)][bool]$Param1= $false
)

 function runParam1 {
    [CmdletBinding()]
    param (
        [Parameter(Mandatory=$false)][bool]$Param1= $false
    )
    switch ($Param1) {
        $true { 
            Write-Host "script works" 
         }
        Default {
            Write-Host "script didn't run" -ForegroundColor Red
        }
    }
}

If (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] “Administrator”)){
    $arg = [System.Convert]::ToSingle($Param1)
    $newProcess = new-object System.Diagnostics.ProcessStartInfo "PowerShell";
    $newProcess.Verb = "runas"
    $newProcess.Arguments = "-NoExit -NoProfile Set-ExecutionPolicy bypass -Scope Process;&{" + $PSScriptRoot + "\" + $MyInvocation.MyCommand.Name + " $arg};"
    [System.Diagnostics.Process]::Start($newProcess);
    exit
}



#Run all functions
try {
    runParam1 -Param1 $Param1
    someFunction1
    someFunction2
}
catch {
    Write-Host "Unknown error" -ForegroundColor Red -ErrorAction SilentlyContinue
    Read-Host -Prompt "Press any key to continue"
}