Editor’s note: This is the second in a two-part series.

In last week’s column, I discussed Carpenter v. United States, No. 16-402 (S.Ct. June 22, 2018). In the case, the U.S. Supreme Court held that the Fourth Amendment prohibited the government from using the Stored Communications Act, 18 U. S. C. Section 2703(d) (the SCA), to obtain from wireless cellphone carriers the “time-stamped record known as cell-site location information (CSLI),” which records, created over time and saved, can, when looked at together, provide a picture of the public movements of the cellphone user.