Joseph Kennedy, Manfred Schenk and Michael Cherry are the only experts to have ever won Innocence, Habeas, Dauberts, and the Exclusion of Drive Tests, Drone Tests, LSite and Call Detail Records (CDR's), against Historical Cell Site Analysis / Cell Tower Tracking. USA v. Roderick Thornton was our first Drive Test Exclusion. USA v. Evans was our first Federal Daubert. Lisa Roberts was our first Innocence.

Our precedent setting wins have been discussed in the following journals: THE WASHINGTON POSTTHE NEW YORKER,  THE ABA JOURNAL, THE ECONOMISTTHE ASSOCIATED PRESS 12/11/2016 and THE ASSOCIATED PRESS 3/29/2017. 

We understand the science. We are members of IEEE Communications Society and several Wireless Associations. Joseph Kennedy has an FCC License. 

We have worked as computer programmers and analysts for communication carriers. Michael Cherry consulted at Bell Telephone Labs. Manfred Schenk consulted at International Telephone and Telegraph. Joseph Kennedy has programmed the AT&T G3 Switch used for both cell towers and land lines.. 

We have defeated the Call Detail Record (CDR) Business Records Exception. In some situations, it is more efficient to use a Judicial Notice of Impossibility to eliminate critical Call Detail Records. 

We have also successfully used evidence hearings including Daubert and Frye to block or modify testimony and exhibits that use the following:
Drive test
Proximity maps
Text message geolocation
Flawed tower depiction based on use of nearest/nearby tower
Flawed call records
Meta data
Sector coverage, Sector range, Sector configuration
Tower range, Tower coverage, Tower interference, Tower configuration, Nearest Tower, 

We are engaged as experts in both pre-and post-conviction cases for defendants in multiple states and federal jurisdictions across the country. Convictions, based on the location of cell phones, or the sectors that they used, should be revisited, using our unpublished newly discovered information. 

We are Biometric, Computer and Cellular Subject Matter Experts. Michael Cherry addressed the United Nations Counter-Terrorism Committee. His topic was Information Technology Security and the latest border-control systems that authenticate the identity of individuals through the use of iris or fingerprint scans. He also discussed the security implications of continuous software updates. 

Some of our major Daubert and Innocence cases include:

  • LISA MARIE ROBERTS - FREED. She after served 12 years for a murder that she did not commit. "Petitioner shall be released from custody unless the State of Oregon elects to retry her within 90 days of the date of this Opinion and Order."  The Honorable Malcolm F. Marsh United States District Judge. The Verizon RF Engineer who claimed that he could prove Lisa’s location based on her cell tower pings, elected to remain silent. Manfred Schenk and Michael Cherry were the Defense Cell Tower Experts and they worked closely with Attorney William Teesdale and other attorneys at the Portland, OR Federal Public Defender Office.                                                                                                         
    Mike and Manfred,
    Lisa Roberts was released yesterday afternoon.  The DA will not
    attempt to prosecute the case again. Thank you so much for your
    work on this case. It was pretty amazing to be there to pick up Lisa
    at the prison gate as she was released after serving 12 years for a
    crime she did not commit. Cheers, William
    William J. Teesdale
    Federal Public Defender Chief Investigator
    101 S.W. Main St., Suite 1700
    Portland, OR 97204 
  • UNITED STATES OF AMERICA V. ANTONIO EVANS - NOT GUILTY. "FBI Special Agent Raschke may not testify concerning the theory of granulization, which the court finds to be unreliable. In addition, the estimated coverage areas contained in summary exhibit 6 must be removed before the court will admit this exhibit." The Honorable Joan Humphrey Lefkow United States District Judge. Patrick Blegen of Blegen and Garvey was the lead defense attorney.
  • UNITED STATES OF AMERICA V. RODERICK THORNTON - NOT GUILTY."The Court would have significant concerns if FBI Special Agent Fitzgerald were to offer an expert opinion on the precise street location or radius where the Defendant’s phone communications were made based on the telecommunications data and methodology identified in his testimony. However, Fitzgerald clearly indicated that based on current data and cell technology infrastructure, he could not reliably offer an opinion regarding the specific location footprint indicated by the phone calls at issue here." The Honorable Amy Totenberg United States District Judge. The defense attorney was Fenn Little. 
    The Court will conference with attorneys concerning the admission of State's Exhibit 3 for trial purposes prior to trial. Modifications are necessary on Pages 7 and 8 or these pages are not admissible as part of Exhibit 3. Otherwise, FBI Special Agent Carman's Exhibit 3 is admissible, Teresa T Pulliam, Circuit Judge. Joseph Kennedy and Michael Cherry supported Defense Attorney, Christopher Daniel.
  • STATE OF CONNECTICUT V. EMMANUEL HILDING SALORIO - NOT GUILTY. The Honorable James Graham, excluded Verizon Call Detail Phone Records (CDR's) from evidence. The prosecutor wanted to use Call Detail Records to support his theory that Mr. Salorio was in the area of the victim's apartment on the night of the crime. Michael Cherry worked with defense attorney Hubert J. Santos.  

STATE OF FLORIDA V. ADRIAN DEON BROWN - NOT GUILTY. On May 11, 2011 Adrian Deon Brown was found not guilty of murder and he walked out of the Ocala, FL County Courthouse. The defense team included Attorney Nicole Hardin, Michael Cherry and Manfred Schenk. Prosecution experts included two Radio Frequency (RF) Engineers, one from Sprint and one from Verizon. 

STATE OF CONNECTICUT V. ANTIONE PARIS DAVIS - NOT GUILTY. On December 15, 2010 Antoine Paris Davis was acquitted in the Middletown, CT Superior Court. He was charged with home invasion robbery, burglary, assault, larceny, conspiracy and accessory to kidnapping with a firearm. His defense attorney Aaron J. Romano used Manfred Schenk, as his Cell Tower Expert. The prosecution used a Verizon RF Engineer Manager. 

On Sept. 20, 2012 Messrs. Joyce, Bligh, and Cashman were reinstated by their employer National Grid. Their employment was terminated eight months earlier when outside cell phone experts accused them of stealing time based on cell tower call detail records (CDR’s). The outside cell phone experts choose not to appear at the final labor arbitration hearing as Manfred Schenk was there to challenge their interpretations. 


Kylia Turner vs. La Tanya E. Lee - INNOCENT

From: Dan Deuprey <>

Sent: Tuesday, April 25, 2017 11:22:37 AM
To: 'Manfred Schenk'; 'Michael Cherry'; 'Michael Cherry'
Cc: Dan Deuprey; Edward J Imwinkelried
Subject: Outcome of Turner trial  

Dear Mike and Manfred: 

We received a jury verdict yesterday in favor of our client (10 to 2), and I want to again thank you both very sincerely for all ofyour efforts in support of our client.  By copy of this to Ed, I am also letting him know that I deeply appreciated his referral to you. 

I will be available to discuss any questions you may have, but preliminarily this is to ask that any additional invoices beyond the last received be sent to me asap for transmission to the carrier for payment.  

In addition to the benefits for our case, your work has been an interesting educational experience for me.  I hope that I may have an opportunity some day to meet Mike personally.  

Warmest regards, 


Dan H. Deuprey 

1901 1st Ave., Suite 330 
San Diego, CA  92101 
Telephone:  619-757-1900 


Link to Breach Avoidance

We vote on law enforcement biometric standards at the invitation of the United States Department
of Commerce, National Institute of Standards and Technology (NIST). We have been voting on
international law enforcement biometric standards for the past 10 years. We have testified at the
National Academy of Sciences.

The United States Department of Justice has favorably reviewed two of our fingerprint articles: How We Can Improve the Reliability of Fingerprint Identification                                     Michael Cherry; Edward Imwinkelried                                                     

A Cautionary Note About Fingerprint Analysis and Reliance on Digital Technology                     Michael Cherry; Edward Imwinkelried                      



Wall Street Journal Quote - Credit-Card Security Falters

ABA Journal - First Daubert Win Against FBI CAST Cell Tower Tracking   We didn't have to learn this topic - we lived it

Judge compliments our cell tower testimony

Associated Press Quote - Effort made to restore photography’s credibility

MIT Technology Review Quote - Finding Evidence in Fingerprints 

Time Magazine 


The location of the cell tower is not the location of the cell phone. The long running myth that calls are simply assigned to nearby cell towers, either the closest or the strongest signal, has helped to place a large number of individuals in prison. We could spend the rest of our lives freeing them. 


We challenge, and then modify or exclude exhibits that use Call Detail Records, Cell Hawk and Drive Test Proximity Maps. This unreliable evidence can be arranged in an endless number of theoretical but unprovable cell phone location / movement theories. We sucessfully challenge this subjective evidence even when it is presented by individuals with very convincing job titles, i.e., RF Engineers. Once again, we could spend the rest of our lives freeing innocent individuals. 


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