Solved by a verified expert :Sampling Issues (graded)

What are the various types of sampling, along with their
advantages and disadvantages? As we think about sampling and ethical practices,
review these two documents on ethical issues in research:

Tuskegee syphilis study at http://www.cdc.gov/tuskegee/
An overview of questionable studies: Resnik, D. (2012).
Research ethics timeline (1932-present). Retrieved from
http://www.niehs.nih.gov/research/resources/bioethics/timeline/index.cfm

What are the implications of this information with respect to
the recruitment of human subjects in a study related to your chosen issue?