This incident probably would not have been averted by the following suggestion but other incidents could be prevented: shops that sell mind elevating edibles could be required to sell a child proof container .. and info sheet describing unfortunate ER experiences in OR or elsewhere.

Habitual use of the tamper proof containers would need to be paramount. 

One problem is that laced orange or other juices in bottles or items may require refrigeration if not consumed in a couple days. So a buyer should also buy a container that could be refrigerated. Whether those under 21 might still be able to access these could be a problem especially if a high THC product with 27% THC were to be accidentally consumed.

Child proof containers could be a fund raiser for a nonprofit org or $ for rehab. 

This does add another dimension to child proofing a home or office for those who may not normally think about the issue when entertaining families etc., especially hosts with no kids of their own.