No such study has been conducted. However, the reality is, the evolution of narcotics, in particular in this case the fentanyl crisis, is really a relatively recent phenomenon, since October 2015, so as a result, there haven't been any comparisons. The ion scan has been there as long as the opioid crisis, for instance, has been.
It's similar to a question that was raised earlier in the sense that it's very difficult to determine what the significance of one tool out of a number of different devices and a number of different strategies would be in terms of increasing or decreasing the amount of narcotics in and out of the institution.