TABLE 5.

LOD, LOQ, and linearity for the three analytes based on the sampling strategy.

Sampling method	Analyte	R^2	LOD (ng)	LOQ (ng)
S	Morphine	0.9939	0.1	0.2
	Codeine	0.9968	0.05	0.1
	Thebaine	0.9979	0.05	0.1
AP–SW–SE	Morphine	0.9979	0.2	0.5
	Codeine	0.9828	0.2	0.5
	Thebaine	0.9947	0.2	0.5