As the subjects locate the hidden population, the research has very little control over the sampling method, which becomes mainly dependent on the original and subsequent subjects, who may add to the known sampling pool using a method outside of the researcher's control.
The research has very little control over the sampling method. The subjects locate the hidden population. The sampling method becomes mainly dependent on the original and subsequent subjects. The original and subsequent subjects may add to the known sampling pool. This known sampling pool is using a method outside of the researcher's control.