AD local query

#Query AD tiering level from AD
Function Get-ADTieringLevel
{

    Param(
        $ServerName
    )

    $OU = ([adsisearcher]"(&(name=$ServerName)(objectClass=computer))").FindOne().path
                
    If($OU.Contains("Domain Controllers") -or $OU.Contains("Tier0")){
        "TIER-0"
    }
    ElseIf($OU.Contains("Tier1")){
        "TIER-1"
    }
    ElseIf($OU.Contains("Tier2")){
        "TIER-2"
    }
    Else{
        "TIERING MISSING"
    }

}