7 CFR §91.20

1. (a)Samples must be submitted to the laboratory in a condition (including temperature) that does not compromise the quality and validity of analytical results.
2. (b)All samples must be submitted in sealed, leakproof containers.
3. (c)Containers for perishable refrigerated samples should contain ice or ice packs to maintain temperatures of 0° to 5 °C, unless a different temperature is required for the sample to be tested.
4. (d)Containers for frozen samples should contain dry ice or other effective methods of maintaining samples in a frozen state.
5. (e)The applicant is responsible for providing shipping containers and paying shipping costs for fee basis tests.
6. (f)A courier charge may apply for the shipment of some samples.