with it, so every pesticide that could have been in that plant material, if it went from let's just say 20% thc and now you've concentrated it to 80% thc, you're also concentrating the pesticide the same amount. >> one of california's state certified labs that approves products for consumer use. this year alone he says they've tested more than 10,000 different products. >> vaping has been around this country for some time, more than a decade. what we're seeing is relatively new. when you add that into the equation on top of all the testing you've codone here, doe it start to lead you to some sort of conclusion. >> i think it leads us to really that there's something going on either in the illicit market that's causing this, you also have a challenge of average consumer not wanting to pay more, so they look at, well, i could buy this for $40 or i can go to a legal store and buy it for $60. >> one way the illicit market keeps the price down, by cutting