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PARKING rangers have a new weapon in their arsenal to crack down on disability-parking permit cheats, but advocates warn it may not be enough to stamp out widespread abuse.  City of Sydney rangers are being equipped with iPads that have access to a database of all permits that have been lost, stolen, destroyed, revoked or issued to people who have died.  The system enables rangers to do on-the-spot checks and issue fines of up to $530 where a permit is being used improperly.