What goes wrong

It was not resecured properly

Updated October 2026

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The failure mode Which is why resecuring is in the senior test A positive signal helps It degrades with use Decanting is the related failure Check it on the actual fill Show the patient, do not just print it References

A child-resistant package only resists while it is correctly closed, and a cap that feels closed is not necessarily engaged.

The failure mode

Push-and-turn and squeeze-and-turn closures can be spun on without the mechanism engaging, giving a cap that is on the bottle and not locked. It feels finished and it offers no resistance at all to the next person who picks it up.

Which is why resecuring is in the senior test

The protocol requires the package to be opened and, where appropriate, properly resecured. A design that is easy to open and easy to close wrongly fails, and that is deliberate rather than an incidental detail of the test.

A positive signal helps

Closures that click, or that will not seat until the mechanism engages, remove the ambiguity. Where the design gives no feedback the user has no way to know, and the instruction has to carry the whole burden.

It degrades with use

The standard expects the package to keep functioning over the number of openings customary for its contents. A mechanism that wears, or a liner that compresses, can leave a package that engaged on day one and does not by week four.

A patient who moves a week of doses into an organizer has created an unprotected container by design. That is a real and common behavior and it is one of the reasons the pill organizer leaf sits in this group at all.

Check it on the actual fill

A closure behaves differently on an empty bottle than on a full one, and differently again over a liner. Testing the resecure on the real filled package is the check, and it takes seconds.

Show the patient, do not just print it

Where a package is handed over in person, thirty seconds demonstrating the close is worth more than any instruction on the cap. The protocol itself distinguishes performance with and without a demonstration, which tells you how much difference being shown makes.

References

16 CFR 1700.15, Poison prevention packaging standards: child-resistant effectiveness of not less than 85 percent without a demonstration, and senior adult use effectiveness of not less than 90 percent. Special packaging must continue to function for the number of openings and closings customary for its size and contents. law.cornell.edu

16 CFR 1700.20, the test protocol. Children aged 42 to 51 months in three bands; panels of 50 rising to 200. Senior adults: 100 participants, 25 percent aged 50-54, 25 percent 55-59, 50 percent 60-70, 70 percent female, with a five minute and then a one minute period, and the package must be opened and properly resecured. law.cornell.edu

Written from the Poison Prevention Packaging Act regulations, not from a test laboratory. Child-resistant packaging is certified by testing a specific package as a system, and nothing here certifies anything. If you need a compliant package, the testing is the route and a matching closure is not a substitute for it.