RecursiveADMembers.ps1

Function Get-ADNestedMemberOf ($userName) {
	# For a specified user get the groups it is a member of recursively.
	$targetUser = Get-ADUser $userName
	$results = Get-ADGroup -Filter {member -RecursiveMatch $targetUser.DistinguishedName}
	return $results
}

Function Test-ADIsMember ($objectDN, $groupDN) {
	# params require full DistinguishedName
	# Generalized for any ADObject and the return is the not null test. This Will produce the same errors as the standard IsMember if either object doesn't exist
	(Get-ADObject -Filter {memberOf -RecursiveMatch $groupDN} -SearchBase $objectDN -SearchScope Base) -ne $null
}