🧪 K67/K68 — EDTA-Preserved Reference Blood Controls
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🧪 Forensic in Edta Testing

K67/K68 — EDTA-Preserved Reference Blood Controls

K67 and K68, known EDTA-preserved reference blood samples from O.J. Simpson and Nicole Brown Simpson used as positive controls in Roger Martz's EDTA testing. Testimony described them as producing strong EDTA signals, including a large 160-ion abundance.

Exhibit labels

How this item was marked across the four trials. The same physical item often gets different numbers in the criminal and civil trials.

K67K67 / K68K67 and K68K68

Source proceedings (4)

Every proceeding where this item was discussed. Click through to the transcript.

Criminal trial (4)

More in Edta Testing

Harmon Letter to Roger Martz Concerning EDTA Testing — Defense 1263 / Defendants' 1223
A two-page letter dated February 16, 1995, from prosecutor Rockne Harmon to FBI Agent Roger Martz concerning EDTA testing of sock and back-gate samples and asking Martz to “refute the possibility” of planted blood. Identified as Defense 1263 in the criminal …
Q206 sock stain LC-MS/MS chromatograms, runs 4088 and 4094 (Defense 1259-A, 1259-B)
Two LC-MS/MS chromatogram runs of Q206, the sock edge cutting: run 4088 (Defense 1259-A; Defendants' 1215) and run 4094 (Defense 1259-B; Defendants' 1216). The candidate rows describe the first as showing EDTA present and the second as a confirmatory positiv…
Rear-Gate EDTA Testing Graphs (People's 544 Series)
People's 544 graph series documenting Roger Martz's LC-MS/MS testing of rear-gate blood Q204 and a preserved-blood control. The series included graphs 544-A through D and chart 544-E; Martz, Robert Blasier, and Marcia Clark offered differing interpretations …
Fredric Rieders' EDTA Report on Gate and Sock Stains (People's 586)
Dr. Fredric Rieders' two-page report dated July 17, 1995, evaluating Agent Roger Martz's EDTA test results for the gate and sock stains. Introduced as People's 586, the report and its disclosure timing were disputed, and prosecutors used its documentation of…
Foreman and Trujillo 1954 EDTA absorption and pharmacokinetics study
A 1954 Foreman and Trujillo study using radioactively labeled EDTA administered to human subjects to examine oral absorption and pharmacokinetics. Rieders and Martz cited it in their dispute over baseline EDTA levels and dietary absorption; its last page was…
Roger Martz criminal trial testimony transcript
Excerpts from Roger Martz's criminal-trial testimony at page 38641, page 38649, and pages 38711–38712. They were referenced in later proceedings for foundation and impeachment concerning whether Martz's methods were quantitative and regarding his Quantico va…
50 ppm EDTA standard chromatograms, February 22 — morning and afternoon runs (Defense 1262-A, 1262-B)
Chromatograms of a 50-parts-per-million EDTA standard run on February 22 at 9:32 AM (discovery page 4077; ion count 319,561; Defense 1262-A) and 1:48 PM (discovery page 4070; ion count 49,393; Defense 1262-B). They were compared during testimony to demonstra…
Q206 sock stain full daughter ion scan, broader mass range (Defense 1259-C)
A full daughter-ion scan chromatogram of Q206 spanning mass range 130–295, described as broader and less focused than prior runs. It was introduced during Dr. Rieders's direct examination and later used on cross-examination to question whether the 132-ion si…
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The Simpson Matter
Department 103
🔬 K67/K68 — EDTA-Preserved Reference Blood Controls
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