GET A NEW ONE!!!! I'm the parent of a peanut allergy child. He has an epi pen on him at all times when not in the house and another one at the office at school. I would NEVER leave my child anywhere with an expired epi pen... it's just irresponsible.

So, No, I wouldn't let a child with an expired epi pen stay in my care. That's when accidents happen.

Now, in saying that... I would keep track of the expiry date and give the client ample notice that I need a new one. You can purchase them from any pharmacy. They could go tonight and bring you a new one tomorrow.