Historical Data

2021โ€“2023 Cannabis Testing Results

99,184 unique samples • 399,135 test records • April 2021 โ€“ December 2023 • 15 laboratories

Data through: December 2023

This site relies entirely on data published by the Cannabis Control Commission via their Open Data Catalog and is only current through the dates they make available.

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Important: This historical data uses different anonymization than the 2025 dataset. We have no confirmation that lab names (e.g., "LabA") in this 2021โ€“2023 data correspond to the same entities as similarly-named labs (e.g., "Lab_A") in the 2025 dashboard. The 2024 data was not included in the state's open data release. This dataset does not include an explicit pass/fail field or heavy metals testing โ€” YM pass/fail is derived using the regulatory threshold of >10,000 CFU = fail. Heavy metals analyses are only available on the 2025 dashboard.

399.1K
Total Records
99,184
Unique Samples
22.5%
Avg THCA
15
Laboratories

Monthly Average THCA (%)

Monthly Sample Volume

THCA Potency Distribution (%)

Mean THCA (%) by Laboratory

Monthly Sample Volume by Laboratory

Lab Sample Volume Heatmap โ€” Monthly

Year-over-Year Comparison

How THCA potency and testing volume evolved across 2021, 2022, and 2023

Average THCA by Year

Samples Tested by Year

Monthly THCA โ€” Year-over-Year Overlay

Individual Lab Profiles

Distribution shapes and potency stats โ€” Overall mean: 22.52% THCA

1 / 15

Potency Reporting โ€” Lab Discrepancies

A 6.63% THCA gap between the highest and lowest reporting labs (2021โ€“2023).

27.49%
Highest Avg THCA (LabT)
20.86%
Lowest Avg THCA (LabB)
6.63%
Gap Between Highest & Lowest
8.7%
Overall Samples Over 30%

Mean THCA % by Lab (with range)

% of Samples Over 30% THCA by Lab

Monthly Avg THCA โ€” Top 3 vs Bottom 3 Labs

Where Each Lab Falls on the THCA Distribution

Statistical Comparison โ€” Lab Potency Reporting

Lab Mean THCA % Above Avg % in Top Quartile % in Bottom Quartile Cohen's d Above +1σ Below -1σ

Who Produces the Outliers? (+2σ and above)

Top 50 Highest THCA Results

# THCA % Lab Zone

Yeast & Mold โ€” Pass/Fail Analysis

Regulatory threshold: >10,000 CFU = fail • 92,208 total YM tests • 8,186 failures (8.9%)

91.1%
Overall Pass Rate
8.9%
Overall Fail Rate
LabB
Highest Fail Rate (16.3%)
LabS
Lowest Fail Rate (0.5%)

YM Fail Rate by Lab

Percentage of samples exceeding 10,000 CFU threshold

YM Fail Rate by Year

Monthly YM Fail Rate Trend

YM Result Distribution (CFU)

Log-scale bins โ€” samples with YM > 0 only • Red bars = above fail threshold

Product Category Analysis

Breakdown by product type โ€” Buds, Concentrates, Edibles, and more

Samples by Product Category

Average THCA by Product Category

๐Ÿ” Data Forensics

Benford's Law compliance and statistical anomaly detection

Benford's Law โ€” Yeast & Mold Results

Chi-squared distance from expected Benford distribution ยท Lower = more natural

Benford's Law Explained

Benford's Law predicts that in naturally occurring datasets spanning multiple orders of magnitude, the leading digit "1" appears ~30% of the time, "2" appears ~18%, and so on. Deviations can signal data anomalies.

Highest deviation:

• LabY: ฯ‡ยฒ=43.57 โ€” 7.8% of first digits are "2" (expected: 17.6%)

• LabO: ฯ‡ยฒ=36.10 โ€” 57.2% of first digits are "1" (expected: 30.1%)

Closest to natural:

• LabE: ฯ‡ยฒ=1.22 โ€” nearly perfect Benford fit

• LabB: ฯ‡ยฒ=3.13 โ€” excellent compliance

ฯ‡ยฒ critical value at p=0.05 with 8 degrees of freedom is 15.5. Labs above this threshold have statistically significant deviations from Benford's Law.

First Digit Distribution โ€” Anomalous Labs vs Expected

Showing labs with highest ฯ‡ยฒ scores against Benford's expected distribution (dashed line)