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They care about hobbyists; they care about professionals.

Early on, the videos fall into the realm of hobbyist experiments: He exploded a small hydrogen balloon; he concocted glass beakers of acids.

Law enforcement sources told The Times that Bartkus was a rocket hobbyist, which Sweetow said will be of particular interest to investigators.

They are hobbyists who enjoy dressing up as cartoon characters and stuffed animals, create elaborate artworks involving anthropomorphic animals and sometimes attend conventions while wearing homemade animal costumes.

Often times, these home-built planes are assembled in home garages for anywhere between $10,000 to $100,000 depending on the types of aircraft a hobbyist wants to fly, according to the Experimental Aircraft Association.