The location that Surfer and Philly are referring to is known as the Sentri station, the turn around point for Taxis and car pools and such, a drop off point to walk the last 100 yards to the US side of the walking border crossing. That has long been the location of TJ Cops shakedown, especially at night when in the cloak of darkness, they claim they are looking for drugs and weopons. There is usually two or more cops on the shakedown team since they operate w a wingman also. If you look more carefully, about half of the time, the uniformed cops is not even a TJ City Policeman, they are transit cops or housing authority cops, who are in it for the money. Probably a gentleman's agreement that the TJ cops will share the wealth for the proceeds obtained. Some are armed, others are not.
Latest 411 was that there were a lot fewer incidents of Shakedowns at tne Sentri post, because..... the drug lords could easily kidnap the cops or gun them down, in an exposed area like Sentri (NO place to duck and hide). Also, the TJ Mayor and Police Chief have had SO many complaints, and tourisim is down over 80-90 % this year due to news reports and the violence and the press, they cannot afford another black eye in the media.
The veteran mongers know to cross the footbridge from the McDonalds over to this side, and the foot ramp takes you past the Sentri Post, and a free sidewalk to the border crossing. Other mongers know a back route with certain taxi drivers to get them safely past the Sentri. But again, the Sentri has been fairly quiet of late, for all of the reasons noted above.
Bottom line, cross back into the USA in pairs or larger, avoid Sentri via the foot bridge or weaving thru traffic and cars, or taxi routes, and hide your money and passports in safe locations like money belts, underwear, socks or your jock strap. Don't go back drunk, and have a good time, if you choose to go South for Tacos.