I have said this before but I will post it again.
WHEN the police came to the house that night for a kidnapped baby call IF Deborah had been so drunk that her behavior was erratic or above the slightest reproach, she would have been field tested, a PBT, or she would have been transported, under suspicion, for a BAC. LE would have, first thing, determined IF she were drunk and thus capable of harming/killing, accidently or otherwise, her baby.
I have been around more drunks than I ever cared to be; my ex, in particular. There is no way, IF Deborah had just murdered her baby, that she could hide that fact. LE is trained to observe and evaluate the situation; if there had been the slightest hint, Deborah would have been taken away that night. She wasn't.