About H1-B and AP

I heard from the previous postings that if you use AP to re-enter US after visiting China, and return to the same H1-B employer, you can still keep your H1-B status. But I asked two immigration lawyers and both said that using AP to re-enter US will automatically invalidate your H1-B status. Can anyone tell me exactly where to look to find the "right" information about the use of AP? There has been too much confusion on this. Thanks in advance.