 A wide range of ways are used to bring NPS into prisons. You've got the traditional methods such as people visiting prisoners, for example, throwing objects over the wall containing NPS. More creative ways include the use of drones. That is a well-recognised phenomenon in English prisons. And also the use of paper, which is being impregnated with synthetic cannabinoids. With these impregnated papers we have similar problems like we have with herbal material, which is that the concentrations in this material may vary over quite a great range. That means if you cut this into pieces that from one little piece of paper you might have a dose, you know, varying by a factor of three or four. So that can, of course, be a big problem in dosing these drugs and may be part of an explanation for the high rate of intoxications and convulsions we see after the use of these drugs. Quite a number of prisons started to not deliver the mail in the paper as it comes but they just hand copies to the prisoners. But of course then they find other ways to transport it into the prison like closings, for example, which are impregnated with substances or other means of transport. So it's very difficult to control because low amounts are enough to produce intoxication on the one hand and on the other hand you can't see or smell the substance because you don't need, you know, big amounts which you can easily see or detect. Specifically looking at supplier reduction in English prisons x-rays are being used, body scanners are being used also methods to interrupt the use of mobile phones and to interrupt the use of drones.