Function to test if the current session is running as an administrator

Test-IsAdmin.ps1

function Test-IsAdmin {
	<#
	.Synopsis
	Tests if the user is an administrator
	.Description
	Returns true if a user is an administrator, false if the user is not an administrator
	.Example
	Test-IsAdmin
	#>
	$identity = [Security.Principal.WindowsIdentity]::GetCurrent()
	$principal = New-Object Security.Principal.WindowsPrincipal $identity
	$principal.IsInRole([Security.Principal.WindowsBuiltinRole]::Administrator)
}