SEATTLE -- Police said thieves disguised as federal agents broke into a Seattle man's home Tuesday to steal his medical marijuana.

Homeowner Roger Spohn said three men dressed as drug agents kicked in a door at his home on Wallingford Avenue North and took some of his medical marijuana.

Spohn said he and some assistants were cultivating as many as 200 plants.

"Some armed men burst in and they were telling us they were FBI and to get on the floor," said Spohn.

When the thieves went to another room to take some of the pot, Spohn realized they were imposters. He escaped and called police.

Officers didn't catch the thieves but they found Spohn's plants, most of which he said he was growing for others to use, primarily those with AIDS.

That night, real police officers hauled all but a 60-day supply of the man's plants out of his home.

"That was over 100 patients' medicine that got taken today," said Spohn.

Police said the Health Department recently came up with guidelines for what is the allowed 60-day supply of medicinal marijuana -- about 15 plants.

Nothing more is allowed, even if grown for other patients.

"Every patient can't grow their own 15 plants. It's fairly difficult to get them to root and keep them alive," said Spohn.

Police said the incident was the first major confiscation they've done since the Health Department drew up those guidelines and their policy is firm.

Spohn said he feels he was victimized twice.

"First with the phony FBI robbery and then with losing all the plants to police," said Spohn.

Police said Spohn does have the right to take medical marijuana for his hepatitis C, but he is only allowed 15 plants.

Spohn's attorney disputes that and said Spohn he may sue the city for the cost of the plants , which Spohn said could be worth more than $100,000.