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Further to Marks comment... Telescopes @ astronomy.com said that a permit etc is only nescessary for >1mW lasers
"If a membership to an Astronomical Society is undertaken, then purchase of a Green Laser Pointer over 1mW is allowed. It is best to confirm information with your local Astronomical society first.
High Powered Green Laser Pointers can be purchased for any worthwhile use, including Mining, Building, Display etc. Federal Laws require the owner to apply for a permit from their states FireArms Dept. The Permit is a B709B and can be downloaded as a PDF File from many State Police web sites."
Might just call them and ask.
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