Boston installs vending machines for addicts with Narcan, fentanyl test kits

I wonder how they are going to prevent abuse-theft, assuming the products are free or under the market's cost. There will always be someone wiping it all (to sell or whatever), and the vending machines will be always empty. Or, if there's some measure (e.g. limiting supply per person via biometrics), it may turn to be a disincentive for some people that need it.