Federal agents should not assume that a person who buys high-tech gardening supplies is going to grow marijuana, say garden supply business owners who are being ordered to turn over sales records to the government.

"I would deeply suspect the constitutionality of all this," said Larry Brooke, owner of General Hydroponics, a Corte Madera, Calif., manufacturer of high-tech gardening equipment. He received one of a flurry of subpoenas served around the country Tuesday by federal drug agents."If this subpoena is not valid I absolutely will not cooperate," said Brooke, who added he was consulting his attorney. "They're on a fishing expedition."

Agents are looking for heavy sales of items such as growing lights, fertilizers, spray-on nutrients and soil substitutes.