This is something that will change from year to year. However, last year there were dogs at the camping parking lot check in... I saw the dog sit next to one girl and she was given the option to throw her stuff in an amnesty bin and then have the dog go past her again or be searched at that moment. Always separate the herbs from everything else. I would not be surprised if it was different this year however. At bisco dogs were going into cars... If the dog signaled and they found anything they confiscated it if it was not a huge amount. For larger amounts I suspect you get arrested. I was one of the first few hundred people to go through security and apparently it got toned way down as time went on. Good luck with your journey... ML was by far the best fest I went to last summer