Major seizures of drugs - such as the millions of dollars worth of ecstasy powder discovered in three imported freezers in Sydney at the weekend - are important but are unlikely to reduce availability on the streets, experts warned today.

Hauls such as Saturdays - which the Australian Federal Police claim would be worth $92 million on the streets - will mean lower quality pills are sold on the streets, they say.

"A single seizure is unlikely by itself to have a major long term effect," said Dr Paul White, former president of the Australian Professional Society on Alcohol and Other Drugs and a professor at the Department of Pharmacology at the University of Adelaide.

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