Marijuana is legal to buy in several states, but no law says that selling it will be free from cumbersome expense and paperwork, especially when it comes to taxation.

Sales of the drug are permitted for recreational use in just four states — Colorado, Oregon, Washington and Alaska — and the District of Columbia; 18 other states allow sales for medicinal use. But marijuana is still illegal under federal law, and that helps explain why production and sale are tightly controlled.

A record of each plant must be maintained, beginning before the seed even sprouts, and it must be updated with every significant movement or activity involving the plant, business owners and their advocates within the industry say.

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Conrad De Aenlle ~ New York Times ~