There are patients who will malinger or fake their illness for secondary gain. This can and does pose many problems for an already overworked and strained medical system. One must always be careful not to assume or overgeneralize during diagnostic interviewing; however, there will be cases in which your skills will be tested.
Please read the article “Detecting Deception†and answer the questions.
http://www.amednews.com/article/20120910/profession/309109942/4/