Any help in these questions please?

Awaiver of the requirement for documentation of informed consent may be granted when: the investigator has no convenient place to store signed consent forms separate from the research datathe only record linking the subject and the research is the consent document and the principal risk is a breach of confidentiality.potential subjects might find some of the research questions embarrassing, personal, or intrusivethe subjects are literate in their own language; however, they do not read, write, or speak english

Marcy tests a solution with a strip of blue litmus paper. the paper turns red. the solution is acidic basic neutral

What conflict ended the false doctrine of "states rights"