Final answer:
Daniel can most likely be diagnosed with schizophrenia, a mental disorder characterized by delusions, hallucinations, disorganized speech and behavior, and lack of emotional expression.
Step-by-step explanation:
Daniel can most likely be diagnosed with schizophrenia. Schizophrenia is a mental disorder characterized by delusions, hallucinations, disorganized speech and behavior, and lack of emotional expression. Daniel's symptoms of believing he is being stalked by a government agency and exhibiting incoherent babbling, soiling of clothing, and catatonic behavior are consistent with the symptoms of schizophrenia.
Learn more about schizophrenia