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Can you provide additional details? Has an arrest been made?
I can find nothing that indicates it's illegal in Montana or in the US laws. In the Montana code, I searched marijuana and heroin and found hits for both. I found nothing under salvia.
There's a Wikipedia article that may also be of interest to you: http://en.wikipedia.org/wiki/Legal_status_of_Salvia_divinorum
So, botXXXXX XXXXXne, salvia doesn't appear to be illegal in Montana. Many people think it's dangerous, but many people also think marijuana is dangerous. I guess it's your choice - just be careful.
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