The Federal law requires that all airborne crafts such as airplanes, helicopters, and blimps file a flight plan before leaving the ground. Mari, a farmer has been using his helicopter to dust crops for the last $5$ years and has never filed a flight plan. Last year he received a warning by a federal aviation officer and warned that failure to comply could result in a fine or imprisonment or both Mari's response was "I am only flying over MY own land, so you can go fly into $\%$$#$\%!"$ Is the federal law valid $?$