are poison still effective even if they've expired?

Answer 1

Poisons, by definition, will harm or kill.

Chemicals, including poisons, have a known strength when they are first formulated and packaged, and the manufacturer uses this information to describe the content and expected effectiveness of the product on the package label.

As time passes, most chemical combinations tend to change, and that can make them less strong, and thus less effective for their intended purpose.

The manufacturer applies known decay formula to decide on the date at which the strength will have dropped sufficiently below the original level, or has changed in some other way , so that it no longer meets the legal requirements of the initial label description. At that point it is said to have expired.

This does not mean the poison becomes harmless after that date and it does not mean that it will ever become harmless, or ever lose its ability to kill.

All poisons and all poisonous compounds must be considered harmful and dangerous. They must always be handled and treated with caution and respect for what they are.

Answer 2

Their effectiveness as a products probably has expired, but I would have to say no about them being non-poison after expiration.

Answer 3

I wouldn't try to prove otherwise.

Dispose of it properly.

Answer 4

I think it will be more dangerous.