function Get-AuthorizedDHCPServers {
    # The configNC is replicated to all DCs in a forest, similar
    # to the schema, so this function will get all authorized
    # DHCP servers in the forest.
    $adsi = [ADSI]( "LDAP://RootDSE" )
    $configNC = $adsi.configurationNamingContext.Item( 0 )
    $names = @()
    $cn = [ADSI]("LDAP://CN=NetServices,CN=Services," + $configNC )
    foreach ( $object in $cn.children ) {
        if ( $null -ne $object.Properties[ 'dhcpIdentification' ] ) {
            if ( $object.dhcpIdentification -eq 'DHCP Server Object' ) {
                $names += $object.Name
            }
        }
    }
    $names
}

$Servers = Get-AuthorizedDHCPServers


#$ComputerName = "PTHADDS03.FMG.local"
#$ServiceName = "DHCPServer"
#$serviceObj = Get-Service -ComputerName $ComputerName | ?{ $_.ServiceName -eq $serviceName } | Select-Object Name, @{Name="Jeremy";Expression={$._Status}}, Status
#$serviceObj

#http://blogs.technet.com/b/heyscriptingguy/archive/2012/11/12/force-a-domain-wide-update-of-group-policy-with-powershell.aspx


$sessions = New-PSSession -ComputerName $Servers
$Sessions
$serviceObj = Invoke-Command -Session $sessions -ScriptBlock {
    $ServiceName = "DHCPServer"
    Get-Service | Where-Object { $_.ServiceName -eq $serviceName } | Select-Object -Property Name, @{Name = "State"; Expression = { $_.Status } }
}

$serviceObj

Remove-PSSession $sessions