As the frequency of tracking has increased, more judges have raised the need for search warrants.

WSJ: Judges Challenge Phone Location Tracking

Radio frequency identification and tracking technology were undreamt of just a few years ago.

FORBES: How Blur Devours Brands

It also likes companies that are working on making smaller batteries, like Qynergy, a New Mexico-based company working on radioisotope batteries, and Infinite Power Solutions, a Colorado developer of thin-film batteries that can power RFID (Radio Frequency Identification) tracking chips.

FORBES: Business In The Beltway

The SEC has already proposed a number of changes designed to address their growing influence, including extra restrictions on broker-dealers that provide direct market access to high frequency traders, a trader tracking system for large traders, circuit breakers that would slow trading in individual stocks if they fall more than 10%, and new rules for off-exchange trading venues.

FORBES: SEC Wants Real Time Trading Data

Radio-frequency identification (RFID) tags used for tracking items like shipping containers and pallets of goods have been around for years.

ECONOMIST: Tech.view

The issue becomes just the latest in a long list of issues the SEC is examining regarding the current U.S. market structure, right up there with high frequency trading, dark pools, flash trading, market access, and trade tracking and reporting.

FORBES: SEC Takes Aim at Wild Market Swings

Linen Technology Tracking, a Miami-based company, recently patented a radio-frequency identification chip designed to keep real-time inventory of frequently misplaced or stolen goods.

CNN: Tracking devices keep tabs on hotel linens