US Patent 9561885 Tamper resistant container

A tamper resistant thermoformed container having a tray and a lid, where the tray has an inside shelf between the cavity floor and a second shelf that extends to a cavity rim, where the lid has a sealing slot formed to engage the inside shelf of the tray, and where the lid also has a latching tab formed to fit into a matching latching hole on the tray. This structure keeps the lid on the tray by a combination of friction between the lid sealing slot and the tray inside shelf, plus interference between the latching tab and the latching hole.