From the linked article,
“Several people showed up at our door, all obviously here for the investigation, and we welcomed them in,”
Never, ever do this. Establish that you know your rights from the start and let the CPS know you are notifying legal council. If I remember correctly absent an emergency order from the court you do not have to let them in. I think CPS brings law enforcement along to intimidate and give people the impression they have more authority than they do.
Mistake number one.