Drug searches not targeted: WA police

West Australian police have rejected suggestions they targeted members of Philip Nitschke's euthanasia group Exit in the search for an illegal suicide drug.

The group said some members had their homes raided for the imported euthanasia drug Nembutal in the past week.

"Exit does not know how the police decided to target the members involved," a statement on Monday read.

But a WA Police spokeswoman said officers were acting on the advice of federal police and Customs, which passed on information about any prohibited drug importation.

"If they ask us, on their behalf, or provide us with information, we can do a welfare check depending on what the item is, or (execute) a warrant just to locate a prohibited drug," she told AAP.

"It's something standard.

"It was nothing specific to this group."

* Readers seeking support and information about suicide prevention can contact Lifeline's 24-hour telephone counselling service on 0800 543 354.