The reason the sheriff who serves the Fort Collins area of Colorado knew the Balloon Boy story was a hoax was because the mother of the boy told him so, the Fort Collins Coloradoan, reported on Saturday,Oct. 24th.
The Coloradoan obtained a copy of an affidavit that Larimer County Sheriff Jim Alderden had used to obtain a search warrant of the Heene home. In that affidavit it was written,"On October 17, 2009, Mayumi Heene told [Sheriff Alderden] that she and Richard Heene had lied to authorities on October 15, 2009. That the release of the flying saucer was intentional as a hoax, that she and RIchard Heene knew all along that Falcon was hiding in the residence. The motive for the fabricated story was to make the Heene family more marketable for future media interest. Mayumi described that she and Richard Heene devised this hoax approximately two week earlier. The experimental flying saucer was specifically made to carry out this hoax. That she and Richard had instructed their three children to lie to authorities as well as the media regarding this hoax."