DR Jane: Apologies for leaving in the middle of the discussion last night.
I shut down my work computer and left for home. Once there, I just didn't log on at all. Had other things to tend to...beans to snap and cook; strawberries to hull, cut up and sugar; and mail to read...lots and lots of mail. And before I knew it, "American Idol" was on....and etc., etc. and so forth.
Now, given something that DR Jennifer has added, I'll conjecture (also given your comment about the kid being fired):
We heard quite a bit of stuff. First, I am under the impression that the boy and the employer (his birth mother) were in some sort of relationship...whether it was ever consummated wasn't alluded to, but I took it that he was infatuated with the boss lady and she had to fire him. Then, as Jennifer pointed out, the doctor followed her son to the workplace and grabbed her son (from the evil clutches of the "other woman"

??), and recognized the boss as her son's mother. And the boss, as the overly (and suspiciously) hysterical doctor drove away, suddenly realized the truth...and ran after them shouting, "He's mine! He's mine!"
I don't have a problem with a locked door because the kid had to have a key. The boss was in the workplace when she was killed and would not have had the alarm activated.
The idea that the birth mother was too "out of it" to remember the doctor is based on the doctor's story...and she was justifying her actions at the time she kidnapped the baby...which means she probably overstated the truth to a considerable degree. The birth mother was not able to defend herself. So...
That's my story (this morning) and I'm sticking to it (for the next couple of hours, since I'm going to a seminar soon).
Re: The vet and those tests (if any). I haven't known a vet who could see an animal and run tests conclusive of anything in one day. I'm not saying they don't exist...my doctor can do some basic blood tests in one day. But, my vet always sent Miss Vickie's blood out....it was always "next day" at earliest.
Still, I know nothing about veterinary practices...perhaps just a superficial examination was all the doctor needed to learn the things he told the father?