The company used to be called VeraChip and changed it’s name a while back. The original product was a “chip” that first carried your medical records and was read by a specific viewing instrument and then later it connected to PHRs, HealthVault being one. There’s not been a big rush for people to be chipped as a personal preference and some states made it illegal to chip a person against their will. That’s was another interesting story out of Georgia a while back:) In 2001 they hooked up with Siemens for another type of chip product with their patents.
PositiveID The “Chip” People are Back-an Agreement with Siemens To Expand Wireless Body Monitoring With A Chip Implant
In addition they went into the glucose monitoring business with a “chip” that can do that too.
Prototype of iGlucose Product Created by Positive ID – Wireless Glucose Readings in Real Time
Now they have the M-BAND to collect data 
and it works for up to 30 days. It will analyze air samples for bacteria viruses and toxins. From the website:
“Designed for either outdoor or indoor environments, the M-BAND will operate from - 25 to 125 ºF. The M-BAND utilizes the industry-standard TaqMan® Real-Time PCR with an end-point read and toxin immunoassays which are well-established in the field for optimal specificity and sensitivity. Designed with a high level of operational flexibility, M-BAND can be remotely set to detect for DNA-based pathogens alone, with or without either RNA-based organisms or toxins, or for all three types of pathogens simultaneously at remotely programmable intervals. Air collection rates of 400L/min have been achieved providing 10 mL of concentrated fluidic sample to the detection system. Sample processing time includes: 60 minutes lysis and purification and a thermal cycling rate of 1.2 min/cycle. The typical time for combined sample processing and detection is 120 min assuming 50 thermal cycles. Toxin analysis time is 40 min. “
A little over a year ago they sold the chip implant business for medical records to VeriTeQ so now you only see the glucose chip referenced on their site.
VeriTeQ Acquisition Corporation Buys VeriChip Implanted Chip and Health Link Personal Health Record Technology from Positive ID–Implantable RFID and Sensors
With the M-BAND if I am interpreting this correctly it can find bad elements in the air as well as cancer causing elements using a portable device. BD
PositiveID's M-BAND system, developed under contract with the U.S. Department of Homeland Security Science and Technology
directorate, is a bio-aerosol monitor with fully integrated systems for sample collection, processing and detection modules that continuously analyze air samples for the detection of bacteria, viruses, and toxins. Results are reported via a secure wireless network in real time to give an accurate and up-to-date status for fielded instruments. Firefly takes the Company's patented molecular diagnostic technology underlying the M-BAND system, and implements it in a handheld device that can be used anywhere, anytime for rapid biological testing. Firefly is being designed as a portable, point-of-need molecular diagnostic system to provide test results from sample input through reporting of results in 15 to 30 minutes depending on the type of test performed.
About PositiveID Corporation
PositiveID Corporation is an emerging growth company and developer of biological detection systems for America's homeland defense industry as well as rapid biological testing. PositiveID is focused on the development of microfluidic systems for the automated preparation of and performance of biological assays in order to detect biological threats at high-value locations, as well as analyze samples in a medical environment. For more information on PositiveID, please visit http://www.PositiveIDCorp.com.
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