Fighting ISIS doesn't just involve bombs. There's a financial side to warfare, as well, like knowing where a terrorist group gets the money to operate and how to cut the flow. IHS, based in Englewood, Colo. tracks this. Their most recent report found the Islamic State pulled in about $80 million a month towards the end of last year. Columb Strack was lead author on the report and spoke with Colorado Matters host Ryan Warner from the office in London.