THE WASHINGTON POST  On the Sunday after Thanksgiving, Sacramento resident Tracy Mapes drove to Santa Clara, flew a drone over Levi’s Stadium and dropped a payload of leaflets espousing his conspiracy theories over the San Francisco 49ers-Seattle Seahawks game.

He then headed across the Bay to the Oakland Raiders game intent on doing the same.

A year ago this month , a San Diego bartender crashed his drone into a fan at the Padres’ Petco Park.

While Mapes was later arrested and the bartender was fined, team security and local police were unable to stop the flights — whether with high-tech jammers or other means .