I'm sure this thread was seen as a chance to beat the PJ (particularly Amaral of course). It hasn't turned out that way though, has it? The only people who were 'very concerned' about the twins were the parents. They didn't do anything about it because..........they were too traumatised or they were able to assess the situation calmly due to their medical training. Choose either explanation but the fact remains they did nothing about their concerns for almost five months. When they did do something Kate was pleased that the tests were inconclusive because no-one could prove that the twins had been sedated. So from telling people she was sure they had been she ends up pleased that it can't be proved that they were. How strange.
Are you sure you're not mistaking "pleasure" for "relief"?
Imagine that the tests had come back positive for, say, benzodiazepines. That would have raised more questions & much more suspicion that the parents were somehow involved. Syringes with fingerprints on may have been miraculously discovered buried in the garden.
I think it was clear during the next few days that the twins were OK. I defy you to say that you'd have disappeared off to the hospital & left your husband to deal with the unfolding situation.
Once again - the fact that the investigating officers chose to neglect this aspect is merely another addition to the list in the catalogue of failures.