Which agency is likely responsible for reviewing criminal investigative matters?

The chosen answer is correct because the DCIS, or the Defense Criminal Investigative Service, is specifically tasked with investigating and reviewing criminal activities related to the Department of Defense. Its focus includes issues such as fraud, corruption, and other criminal matters that impact the integrity and security of defense operations. This means that when criminal investigative matters arise that pertain to defense contracts or personnel, the DCIS is the agency that would handle those reviews.

In the context of the other options, the DEA, or Drug Enforcement Administration, primarily deals with the enforcement of controlled substances laws and regulations, not general criminal investigative matters. CUSA does not correspond to a known agency concerned with criminal investigations, and DACS does not have a well-defined role related to criminal investigations. Therefore, DCIS stands out as the most relevant agency for the task described in the question.