The authors of DSM-5 have removed the DSM-IV concerning the legal problems as there is a craving or urge to utilize the substance under DSM-5.
A mental disorder is a kind of mental illness suffered by an individual. It can be in the form of anxiety, depression, dementia, etc.
DSM stands for Diagnostic and Statistical Manual of Mental Disorders. It is the manual used by psychologists, psychiatrists, etc, to diagnose any mental illness of their patients.
The DSM-IV has used two substances in identifying a mental disorder where one is substance abuse and another is substance dependence whereas the DSM-5 utilizes both substances into a single substance called a substance use disorder. As a result, there was a craving or urge to use DSM-5 which leads to the removal of DSM-IV.
Therefore, the authors removed the DSM-IV in order to use DSM-5.
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