I think there might be a little misunderstanding here.. the post you quoted, TJ, was referring to lasers in airspace, but the quote you posted as rebuttal was about maximum power from a laser pointer.
Steve001 is partially incorrect however, and TJ is partially right in responding with power output regs. There is no federal law that says a person cannot shine a laser with a power LESS than 5mW into the air, but the same law that says you cannot use a laser OVER 5mW in public also covers using a laser over 5mW to point in the air.
I see bad info dispensed over and over so much. People just don't take the time to read these documents correctly.
Unless the law has recently changed the CDRH has no regulatory jurisdiction over what the singular hobbyist does with their laser. Barring intent to interfere or do purposeful harm the federal government nor state or local government cares what the hobbyist does with their laser device.
The misunderstanding occurs because the documents being cited are misinterpreted to include *hobbyists, but actually are concerned with specifically commercial ventures i.e. laser light shows, surveying, scientific applications and any other venture that is put on for **public display. There are no power regulatory limits either. You need to read all of the available documents in their full context not just parts of them and you need to read them more than once if you have not. So to state again unless the law has recently changed what the hobbyist does with their laser is not govern by federal law. By the way the document you cited confirms what I've just written.
*nowhere is that word used or any other word with a similar meaning used in any FDA or FAA or CDRH document that I'm aware of at this time
** this does not mean, imply or include some individual out in public showing off their laser device.
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