Michael Cherry and Manfred Schenk are the only experts to have ever won Innocence, Habeas or Dauberts against Historical Cell Site Analysis / Cell Tower Tracking. A good innocence example is Lisa Marie Roberts who served 12 years for a murder that she did not commit.   


  • Call Detail Records (CDR’s)
  • Triangulation 
  • Ping / Conversation
  • Proximity Maps
  • Nearest Tower / Best Tower
  • Granulization / Centroid Theories
  • Drive Tests
  • Per Call Measurement Data (PCMD) 

They have many years of computer network experience and computer networks are required to integrate and control all of the components needed to place a successful mobile phone call including: cell phones, cell towers, billing and land lines. Cell phones are computer network peripherals that use radio frequencies (RF) as their wireless media. 

Their specialized knowledge allows them to use IT measurements including capacity and performance considerations as well as radio frequency (RF) knowledge to explain and refute frequently misunderstood call detail records (CDR’s) and PCMD assumptions.

 Their unique backgrounds include:   

  • Real telephone carrier experience
  • Radio frequency (RF) experience
  • Large scale information technology (IT) capacity and performance experience. 
  • Computer network design, management and integration experience.
  • GPS Tracking
  • Triangulation Tracking

Courtroom examples of their winning cases against RF Engineers and FBI Cell Tower Experts include:

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

On September 17, 2012 Antonio Evans was found not guilty of kidnapping. In this case the prosecution used an FBI Cell Tower Expert and the defense countered with Michael Cherry and Manfred Schenk. UNITED STATES V. ANTONIO EVANS, 892 F. Supp2d. 949 (N.D. ILL. 2012). Patrick Blegen of Blegen and Garvey was the lead defense attorney.

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 the employment of Messrs. Joyce, Bligh, and Cashman was 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.  

On May 28, 2014 Lisa Marie Roberts, of Portland, Oregon, was released from prison after serving 12 years for a murder she didn’t commit. LISA MARIE ROBERTS ORDER CR233. The Verizon RF Engineer who claimed that he could prove Lisa’s location after her initial arrest, subsequently choose 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 

I would like to endorse Michael Cherry for anyone who has a case where 
cellular tower records are being used to locate the position of a defendant 
or witness. He assisted me greatly in my last trial that ended in a not 
guilty verdict. I spoke with the jurors who all stated after the cross exam 
of the state's expert and our presentation of evidence, the cellular tower 
location was not even a consideration. We should all be pushing for this 
evidence to be tossed out in a Daubert/Frye hearing. While one was held in 
my case and the judge allowed the evidence in, the jury was bright enough to 
know what to do with this type of evidence- throw it out! 

Thank you Mike and Manfred! 

Aaron J. Romano, P.C.- Trial Attorneys 
45 Wintonbury Avenue, Suite 107 
Bloomfield, CT 06002 
Tel: (860)286-9026 
Fax: (860)286-9028 
Licensed in CT, PA, USVI 

Michael and Manfred met when they were both working on Apollo 11 The Trip To The Moon. They are mainframe, SCADA and PC assembly language programmers who design and live communications network products and solutions. The New Yorker Magazine and The Washington Post have both written cell phone tracking articles based on our wins:



Daubert - STATE OF MICHIGAN v. QUINTEL ANDREW WEST - Prosecution maps are misleading.

 "... It was clear to the Court that Manfred Schenk's testimony destroyed the testimony of the People's expert." Honorable Geoffrey L. Neithercut, State of Michigan Motion for New Trial of Tajan Marnez Williams.

Michael Cherry in the ABA JOURNAL. 


After listening to the defense testimony, Judge Joan Lefkow concluded that the prosecution testimony was unreliable.  In her words,

[The prosecution expert, FBI CAST] Special Agent Raschke testified that using a theory of granulization he can estimate the range of certain cell sites based on a tower’s location [relative] to other towers.  This in turns allow him to predict the coverage overlap of two closely positioned towers.  Special Agent Raschke testified that he has used this theory numerous times in the field to locate individuals in other cases with a zero percent rate of error.

Judge Lefkow was “unconvinced that [the prosecution’s] granulization theory is reliable.”  She found that the theory “remains wholly untested by the scientific community.” Her Honor commented that “[e]stimating the coverage area of radio frequency waves requires more than just training and experience;  it requires scientific calculations to take into account factors that can affect coverage.  Special Agent Raschke presented no scientific calculations and did not consider a variety of relevant factors.”  In her ruling, she excluded both part of Agent Raschke’s testimony and a chart purportedly estimating the range of coverage of the cell towers involved in the case.

ABA Journal - We Win Daubert.

Contact Manfred Schenk or Michael Cherry

(888) 827-7240   (714) 202-6480  (201) 513-8300



-----As plaintiff historical cell phone tracking experts we successfully helped three fired electrical workers return to their former jobs. 

Judge Compares FBI Agent Testimony with Ours

Cell Tower Junk Science - Defense Attorney's Describe Cell Location Victories that We Shared - JUDICATURE Magazine 


Contact Manfred Schenk or Michael Cherry

(888) 827-7240   (714) 202-6480  (201) 513-8300


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