MP Phil Edman said he was appalled his staffer was able to buy $70 worth of the synthetic drugs at two shops in the Rockingham area, one of which is opposite a high school, and even given a receipt.
"I sent my staff down there on Monday with some cash and they quite simply bought some (synthetic) cannabis with ease," Mr Edman told Fairfax radio on Wednesday.
"They were actually told how to use it and you either use it in a cone or a bong or a pipe.
"But they made it very clear to start with (use) small amounts and build up in strength and quantity, and this is to help limit any adverse reaction to the chemicals as they're not sure what chemicals are in it."
Mr Edman said the current WA legislation banning synthetic drugs could not keep up with manufacturers who continued to abuse a legal loophole in the law by altering a product's chemical composition, making it exempt from the ban.
"What I've asked the government is 'why can't we look at broader legislation that completely stamps out synthetic cannabis with chemicals?'
"These shops are preying on the weak minded and probably people with mental illness.
"I'm also concerned that minors might be able to purchase these dangerous products."
When asked live on air by Fairfax radio, one of the shops denied selling synthetic cannabis.
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