How do i become a sniffer dog handler?

I have owned German Shepherds before and have an SIA License and now I wish to work as a sniffer dog handler. Does anyone know the best way to do this? Should I get the dog first? can I do the course myself and be self employed? and I don’t want to train with dummy drugs so would need to be home office accredited to carry narcotics, if thats possible?? please help I have come to a dead end with the websites.

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