How would you know?
Those are excellent questions, ST.
Should this law be enacted, there will unquestionably be those who sometimes intentionally and occasionally inadvertantly cross the lines it draws. That's true of most laws, of course, but you are correct to point out that this particular law would govern events to which there are often few witnesses. I also think, though, that the good point you are making can be easily exaggerated. I honestly believe that most folks do make a sincere effort to conduct themselves in accordance with laws of which they are aware, particularly if they (like the abortion provider) are going to be confronted with repeated exposure to the risk of discovery if they make a habit of purposely evading the law.
Compromise is usually uncomfortable, but I think that this proposed law should be supported if it is all that is reasonably achievable at this point and if it can be fairly said that it will prevent any of the abortions that you wish to prevent. Under such circumstances, particularly where issues of life and death are in the balance, a little something is usually better than nothing at all.
Usually, and it looks to be that way in this case.
That said, I think the Democrats had a lot more to lose from a high-profile, bare-knuckled fight over infanticide and PBA than did the GOP.