The trackingNumber on a ChainOfCustody lets you verify that a sample cooler reached the lab before holding times expire. When samples are shipped on a tight analytical schedule, monitoring the carrier's tracking status against the expected delivery window can prompt you to call the lab if something is delayed. Record the tracking number at the time of shipment and save it here so you have it for follow-up without digging through paper records.
Technical section
Data model, API, and internals — visible to developers.