I have a family member who works for Abbott in this product line and he recently commented to me that Abbott went to great lengths testing to detect any melamine in their formulas or from where their ingredients originated.
He remarked Abbott is very serious in ensuring the best possible quality of their products.
If people tested the water that they use to wash the baby bottles, I know they'd find far, far worse. That's not going to stop them from washing baby bottles, however.
Did you expect him to say his employer is sloppy and lax? I've yet to encounter a professional/technical/administrative employee (non union) who would say anything like that.
The company may, in fact, be highly responsible and vigilant. The problem is that when big potential costs come up, affecting profitability, actions don't always follow stated goals.