Sometimes the report is fine, but you're asking for something it can't deliver. For example, a COA for a raw nicotine solution won't tell you about the finished product's puff count. That's not a lab error—it's a scope mismatch. Know what you're buying and what the report covers.

Another common user error is expecting one COA to cover multiple flavors. Each flavor batch needs its own report. If you're buying LINQ-SLIM in three flavors, you should get three COAs. Don't assume one report covers all.