"TECS was the first pre-DHS database of Federal government logs of international travel. Several other “systems of records” (a term of art used in the Privacy Act) about travelers, including the Automated Targeting System (ATS) and DHS copies of PNR data (airline reservations) were originally considered part of TECS. The TECS file for an individual traveler typically includes a log of their border crossings (with record locators that serve as pointers to their PNR data ) and free-text notes on anything that customs and immigration inspectors thought warranted inclusion in the traveler’s permanent file."

Example on http://hasbrouck.org/documents/secondary.pdf

Is there a way to consult this database? (FOIA?)

It could be interesting.