Check if Running As Administrator

Have you ever had a script that requires it be run in “Run As Administrator” mode and needed a function to check that? When I run into this I use the following function:

function Confirm-RunningAsAdministrator
{
<# 
.SYNOPSIS 
This function will return a bool, "True" if running as administrator,
"False" if not.
  
.DESCRIPTION 
You can use this script to check is you are currently running as
administrator. It is best used when your script needs to verify
that this is the case.
  
.EXAMPLE 
    if (Confirm-RunningAsAdministrator)
    {
        Write-Host "Running as an administrator."
    }
    else
    {
        Write-Host "NOT running as an administrator."
    }

    ----------------------------------------------------------- 
    If running as an administrator, this would produce: 
      
Running as an administrator. 
  
.INPUTS 
None. 
  
.OUTPUTS 
[bool] - "True" if running as administrator, "False" if not. 
  
.NOTES 
Original Function name: Confirm-RunningAsAdministrator.ps1 
Original Author: Norman Skinner 
Original Created on: 12/05/2012 

HISTORY:
    ===========#================#=========#============================
    Date       | User           | Version | Description
    -----------+----------------+---------+----------------------------
    12/05/2011 | Norman Skinner | 1.0.0.0 | Created script
    -----------+----------------+---------+----------------------------
               |                |         |
    -----------+----------------+---------+----------------------------
#> 
    $WinIdentity = [Security.Principal.WindowsIdentity]::GetCurrent()
    $currentPrincipal = New-Object Security.Principal.WindowsPrincipal($WinIdentity)
    $AdministratorRole =  [Security.Principal.WindowsBuiltInRole]::Administrator 
    return $currentPrincipal.IsInRole($AdministratorRole)
}