You must locate non-compliant 802.

A spectrum analyzer, because it can show the energy footprint of a device using WPA differently from a device using WPA2.

A spectrum analyzer, because it can decode the PHY preamble of a non-compliant device.

A protocol analyzer, because it can be used to view the spectrum energy of non-compliant 802.11 devices, which is always different from compliant devices.

A protocol analyzer, because it can be used to report on security settings and regulatory or rule compliance