Here are the rules I'd apply if I were buying wholesale today:

• Rule 1: No batch-specific COA, no order. Non-negotiable.
• Rule 2: Lab must be accredited and identifiable. If I can't find the lab, I walk.
• Rule 3: Results must match the label. If the nicotine is off by more than 10%, that's a warning sign.
• Rule 4: Test methods must be standard for the substance. No weird proprietary methods.
• Rule 5: If the report is older than six months, ask for a fresh one. If they can't, that tells you about their inventory turnover.

These rules are simple, but they'll filter out 80% of the noise. And when you're dealing with compliance, that's a big deal.

For more on why reports get rejected and how to fix the common issues, check out our guide on why your lab testing reports get rejected. And if you're sourcing cartridges in the EU, these COA questions will help you ask the right things.

Remember, a lab report is a tool, not a trophy. Use it to make smarter buying decisions, not to decorate your compliance folder.