 Of course, search history cannot prove people are seeking out the drug. However, Lee says his lab has shown it can be a pretty reliable gauge of drug use, for example, with cannabis products. It's not perfect. It's a proxy measure. But it gives you a general sense, in the absence of other measures, what trends might be going on. Drilling down further, Lee showed the uptake in Internet queries on microdosing correlated with policy changes on psychedelics and cannabis.