From the Wiki article
" Cannabis has higher reflectivity at certain wavelengths than other rural crops, such as corn. Law enforcement agencies have found that the use of this technology has become necessary in their detection efforts because many growers hide cannabis among other plants, making detection with the naked eye difficult even from the air. These techniques are effective and difficult to defeat because a plant's reflective signature is difficult to change or mask."

http://en.wikipedia.org/wiki/Cannabi...on_and_the_law
harris7 Reviewed by harris7 on . is this true? Sup guys. Not sure if this should be in growing or legal lol but anyways... A friend of mine told me that if you grow outside helicopters use like heat sensors or somethin and they can see ur plants. He said the plants retain heat and are visible. Is this, in fact, true? Rating: 5