Powershell help filtering an existing Array

I have an existing Array that I've created with the following code (helped by another member of EE:)

Foreach ($ou in $OUList){$results = Get-ADUser -SearchBase $ou -Filter { memberof -ne $HitachiGroupDN -and memberof -ne $TestAccountsGroupDN -and memberof -ne $ServiceAccountsGroupDN -and enabled -eq 'True'} -Properties  mail,GivenName,sn,Department,WhenCreated,thumbnailphoto}

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I have another script that I need to take this same list, and figure out who doesn't have a value in the AD Attribute "thumbnailphoto". How do I pass the variable back in ? would I use a foreach and go back through the $results variable?

Any help would be appreciated.