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Hi Gabby, Thanks for the additional details and confirming this is causing you an issue. The only analyte on this IFU is Ethanol so we have not tested the product for anything but that. Allow me to loop in @Kevin Kopp from UTAK Tech Support to review and respond. Please allow us 1-2 business days to investigate this and get back to you. Kevin- Sales order 56406, part# 31080, lot# D6424. See below email chain as well as attached data for the issue. Thank You, Andrew Hartmann Business Development Manager – 25020 Avenue Tibbitts Valencia, CA 91355 – D +1.661.567.0667 P +1.888.UTAK.LAB F +1.661.294.9272 – Book a Meeting with Me https://calendly.com/ahartmann-utak/30min utak.com From: Gabriela Villalobos <gvillalobos@hfsctx.gov> Sent: Tuesday, September 16, 2025 11:00 AM To: Andrew Hartmann <ahartmann@utak.com> Cc: Brooke Mendenhall <bmendenhall@hfsctx.gov>; Corissa Rodgers, M.S. <crodgers@hfsctx.gov> Subject: Re: UTAK Ethanol Control Inquiry Hi Andrew, It's causing an issue. Last week we noticed that there were small humps in our chromatograms for our LMQC (low aqueous mixed volatile control - 0.0192 g/100 mL), these are typically run after the BQC1 (the 80 mg/dL ethanol control from UTAK). We also found that the concentration for Methanol was high in the FID2B. We believe that something from the UTAK ethanol control is causing carryover and causing the methanol to be almost double the target concentration, see attached chromatogram. We found a temporary solution, that is to add air blanks after the BQC1, so these humps don't appear on the LMQC chromatograms. The analyst who was reviewing these air blanks noticed these peaks in the air blank chromatogram, see below: What analytes are in the IFU, if you don't mind me asking? Could you ask your technical team to see if they can find out what other analytes/drugs may be present in the matrix? Best, Gabby. ________________________________________ From: Andrew Hartmann <ahartmann@utak.com> Sent: Tuesday, September 16, 2025 9:50 AM To: Gabriela Villalobos <gvillalobos@hfsctx.gov> Cc: Brooke Mendenhall <bmendenhall@hfsctx.gov> Subject: RE: UTAK Ethanol Control Inquiry CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hi Gabby, I am not sure I understand the issue, can you provide some additional details regarding this? Is it causing an issue, or more a curiosity? I can say in general, UTAK is only controlling and testing for the analytes on the IFU. What that means is there could be any number of other drugs/analytes present in the matrix. Similar when it comes to testing. A 3rd party lab runs it just for the analytes on the IFU so we don’t get data back on what else may be in the matrix. If this info isn’t sufficient, I’ll flag this for our technical team to review and respond once we get a bit more insight into how this is impacting you. Thank You, Andrew Hartmann Business Development Manager – 25020 Avenue Tibbitts Valencia, CA 91355 – D +1.661.567.0667 P +1.888.UTAK.LAB F +1.661.294.9272 – Book a Meeting with Me https://calendly.com/ahartmann-utak/30min utak.com From: Gabriela Villalobos <gvillalobos@hfsctx.gov> Sent: Tuesday, September 16, 2025 9:43 AM To: Andrew Hartmann <ahartmann@utak.com> Cc: Brooke Mendenhall <bmendenhall@hfsctx.gov> Subject: UTAK Ethanol Control Inquiry Good morning Andrew! Hope all is well! I was hoping you would be able to assist us. Our alcohol analysts noticed some peaks on their air blanks after the ethanol control (lot: D6424) vial was analyzed. I wanted to show you the chromatograms to see if this is normal when UTAK tested it? or if you've gotten feedback from other labs? Best, Gabby. Gabriela Villalobos Forensic Technician Ofc: +1 832 376 8378 Cell: Houston Forensic Science Center 500 Jefferson St. 13th floor