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In what way would the legal variety be distinguishable from the
illegal one,
to the eyes of a prying officialdom?

Smell, certainly. But the main way an official can tell if a crop is
legal or not, is that you must have a licence to grow it. If you don't
have a licence, pack your steel-seated pajamas, you're off to prison.

However, if you knew where it was going to be grown commercially, you
might substitute a block of something smelly where you know where to
find it.

It'd probably grow too high, or give itself away somehow.

--
Rusty Hinge http://www.users.zetnet.co.uk/hi-fi/tqt.htm

Dark thoughts about the Wumpus concerto played with piano,
iron bar and two sledge hammers. (Wumpus, 15/11/03)