Industrial Hemp Inspection and Testing


The Department of Agriculture, Trade and Consumer Protection can inspect all growing sites, fields, processing facilities, conditioning plants, storage locations and any other location associated with industrial hemp. Inspections may be at any time, and may be unannounced.


Pre-Harvest Notification
​You must notify DATCP 30 days before you harvest your crop. We will contact you about two weeks after you notify us to schedule sampling. Please contact us if you have not heard from us two weeks prior to your planned harvest date.

You can notify us via email to​ or via voicemail to (608) 224-4629.Your email or voicemail must include:

  • Your name
  • Your license number
  • The date your expect to harvest
  • The hemp variety or varieties and location or locations
  • The best phone number to reach you to schedule sampling

Licensed growers must notify DATCP at least 30 days before harvest is expected to begin, so department inspectors can collect samples for THC testing. Inspectors will sample each field, and each variety planted.  If you have two separate fields, both planted to the same variety, the inspector would sample each field. If you have more than one variety planted in a single field, the inspector would sample each variety. The sampling process entails taking a cutting from the top 2 inches of multiple plants across the field to get an overall composite sample that is representative of the entire field. 

The samples will go to the DATCP laboratory. The labs will dry each sample and analyze it for delta-9-THC levels. The grower will get a written analysis of the test results. We expect that it will take about 3 weeks from the date of sampling before growers receive their results.

Fit for Commerce Certificates
DATCP will issue a “fit for commerce” certificate for industrial hemp that passes the lab test. The certificate must accompany the hemp from licensed grower to licensed processor. Licensed processors must get a copy of the certificate for all hemp obtained from licensed growers. The department may seize harvested industrial hemp found without a certificate, and may suspend or revoke grower or processor licenses.

Failed Tests
If the analysis shows THC levels above 0.3 percent, it is a failed test. Growers can request a resampling, at their expense. Only one resample per field or variety is permitted. If the retest fails, the grower will have 10 days to destroy the entire field where the sample was collected. DATCP will inspect the field after 10 days. If the crop has not been destroyed, DATCP may destroy it and invoice the grower for the cost.

$250 per composite sample and test (each field and variety will need at least one sample/test). DATCP will invoice growers.

Back to main Industrial Hemp Research Pilot program page