Theres been lot of confusion for me regarding this tricky issue.

How to re-enter US when you are on H1B and if you also have an approved Advance Parole. I have seen contradicting information regarding this.

But, I assume the latest bulletin from Murthy.com will surely clear some of my confusion. Hope it does yours too..

One Entering on AP Becomes a Parolee

It is a common misconception that entering the U.S. on a valid AP will not impact one’s H1B (or L-1) status. An individual with a pending I-485 application, who is eligible to enter in H1B (or L-1) status, may do so without abandoning the I-485 application. Using the AP to enter the U.S., however, terminates one’s nonimmigrant H1B (or L-1) status. The reason for this is that an entry on AP is not considered an admission in any particular status but, rather, it is a separate form of entry known as parole. Since the most important document evidencing one’s status in the U.S. is the I-94 form, one may easily determine the category of entry by looking at the I-94 issued at the port of entry. One who enters the U.S. on AP has a notation on the I-94 indicating that s/he is paroled into the U.S. An individual who uses a valid H1B (or L-1) visa to enter the U.S. is issued an I-94 specifying the appropriate nonimmigrant status and the date of expiration.

The complete analysis, however, is not quite so simple. Under Legacy INS memoranda issued March 2000 and revised in May 2000, the H (or L) individual who enters on AP does not lose all benefits related to the H-1 (or L-1) status. This is wherein the confusion arises, as explained below.