Table 1.

The number of methamphetamine samples categorized in a specific pH range (stem and leave table) and the median pH.

pH values	No. of samples in area
3.0–3.4	2
3.5–3.9	2
4.0–4.4	4
4.5–4.9	9
5.0–5.4	4
5.5–5.9	2
6.0–6.4	3
6.5–6.9	1
7.0–7.4	2
Median pH = 4.87