Vincent Mehdizadeh made the vending machine to get marijuana. The PVM verifies that the user is legally allowed to purchase medicinal marijuana by requiring a prescription card and a fingerprint that is associated with the holder of the card. Sadly, the machine does not allow any one user to take more than one ounce of medicinal marijuana a week :( Each transaction gives the customer about one-eighth to two-eighths of an ounce. Another benefit of the machine, according to Mehdizadeh, is lower cost. By eliminating the workers behind the counter at the distribution centers, buyers will pay $20 to $40 less per one-eighth of an ounce.