EPA Method 8000D initial calibration criteria, explained.
Method 8000D sets the calibration rules behind every SW-846 chromatographic method. Passing r² is only one of its tests. The model-independent checks in Section 11.5.4 are where most curves are actually decided.
The acceptable r² for a calibration curve, and why it is not enough.
What is an acceptable r² for a calibration curve? Most methods accept 0.99. Here is why that cannot confirm low-end accuracy, and what to check instead.
California DCC pesticide action levels take effect October 1, 2026
Date: October 1, 2026 California’s Department of Cannabis Control rulemaking DCC-2025-03-R, approved and filed with the Secretary of State on July 27, 2026, took effect October 1, 2026. It rewrites the pesticide residue action levels for cannabis products in 4 CCR 15719 and 15731, replaces the old detect or not-detect categories with numeric action levels […]
Oregon proposes ICV and CCV limits and THC and THCA LOQs for cannabis testing labs
Date: September 30, 2026 The Oregon Health Authority filed proposed amendments to OAR 333-007 (cannabis testing standards) and OAR 333-064 (laboratory requirements and ORELAP accreditation) on September 30, 2026. The package allows a documented reanalysis when a potency result misses a declared target by more than 10 percent, adds quality control limits for initial and […]
Nevada R152-24 cannabis regulations clear the Legislative Commission with new laboratory provisions
Date: September 24, 2026 Nevada’s Cannabis Compliance Board adopted regulation R152-24 on June 18, 2026, and the Legislative Commission gave it final approval on September 24, 2026. Sections 62 to 74 revise the rules for cannabis independent testing laboratories: the standards and guidelines a lab must follow are adopted by reference, the quality program must […]
DoD ELAP deadline for QSM 6.0 accreditation
DoD’s EDQW set June 30, 2026 as the date by which all DoD ELAP laboratories had to hold accreditation to QSM Version 6.0 or lose accreditation status. QSM 6.0 restructures requirements around ISO/IEC 17025:2017 and updates sensitivity and method-specific requirements.
TNI releases voting draft of a quality management module aligned to ISO/IEC 17025:2017
TNI published a voting draft of Volume 1 Module 2, approved by its Quality Management Systems Expert Committee on May 14, 2026, that rebuilds the general lab requirements on ISO/IEC 17025:2017 text. If adopted it would be the first major replacement of the 2016 standard’s general requirements.
EPA formally proposes PFOA/PFOS compliance extension and rescission of four PFAS limits
Two proposed rules in the Federal Register would give systems with federal exemptions until 2031 to meet the PFOA and PFOS limits and would remove the limits for PFHxS, PFNA, HFPO-DA and the hazard-index mixture. Monitoring and reporting timeframes from the 2024 rule were left unchanged; comments closed July 20, 2026.
DoD EDQW issues QSM 6.0 supplemental information, version 9
The DoD Environmental Data Quality Workgroup posted version 9 of its QSM 6.0 supplemental information ahead of the QSM 6.0 transition deadline. Labs and data users should check it alongside the QSM 6.0 tables when setting calibration and QC criteria.
New York OCM revises the Cannabis Laboratory Quality System Standard
Date: February 9, 2026 The New York State Office of Cannabis Management issued a revised Cannabis Laboratory Quality System Standard dated February 9, 2026, alongside a revision of the laboratory testing limits that aligns analytes with the Metrc product category chart. The standard sets the quality system every permitted cannabis lab in New York must […]