'POT' Spotters

Awhile back ago in spring, Fox 5 was doing this report on this operation 'weed and seed' which part of involved 3 helicopters sole purpose was to ride around looking for cannabis. And the amazing part was these pigs were spotting cannabis little bitty plants 500ft in the air with nothing but there naked eyes. (I'm sure they were using infra-red too) But it still made me quite paranoid, anybody know anymore information on these guys? By the way, they really take to the sky in the upcoming months. STAY SAFE!