The first challenge to obtaining a waiver, or ascertaining the best way to overcome denial of entry into the United States is figuring out what information the U.S government has on you. The U.S. has a lot of information publicly available such as from here https://www.dhs.gov/foia-library and look here https://www.uscis.gov/records/electronic-reading-room.  However, you also want

Persons inadmissible because they were convicted of (or admit to) engaging in prostitution (See INA §212(a)(2)(D)(i) can use the less burdensome standard for a INA § 212(h) waiver.  Technically, the applicant for a waiver only needs to show her admission is not contrary to the national welfare and has been rehabilitated.  (INA §212(h)(2)) “Hardship to

While the law still allows the U.S. CBP (Customs, Border Patrol) to conduct a limited search of a cell phone or laptop at the border without any suspicion whatsoever based upon  the border search exception which is designed for customs inspections, the court re-visited United States v. Cotterman, 709 F.3d 952 (9th Cir. 2013)