Click on a circle in the chart to view Sham immigration records. You can find out when most of the Sham families immigrated to the United States. You can focus your search to immigration records dating from that era. Immigration records can tell you an ancestor's name, ship name, port of departure, port of arrival and destination.
Probably, however...: As my colleague dr. Pappas mentions, marijuana is almost always tested in urine rather than blood, so someone would almost certainly pass a blood test but is more likely to face a urine test.
Blood tests do not pick up previous or concurrent use of cigarettes. The blood tests indicate only certain functions like - Liver and kidney function., Blood count level., Cholesterol levels. If you have smoked marijuana in the last four weeks, this can be picked up through a urine test.-. Source(s): -.