Most people who do taxi runs are illegal and not properly insured to carry paying passengers. make sure anyone you get are legal and registered they should have a SP sticker on their car.
I think what he was warning you about is that the Police are clamping down on illegal "taxi" drivers. IE stopping vehicles leaving the airport, separating the driver from the passengers and questioning both to establish how you know the driver, etc. Illegal taxi drivers stand to lose their cars and get heavy fines.
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