For example, in the UCR, law enforcement agencies differ in how they categorize certain crimes; therefore, the statistics are not accurate: similar crimes may belong to only one category. Additionally, agencies can make errors in reporting this data. In the NCVS, one of the drawbacks is overreporting. For example, citizens take the opportunity to report cases that are not considered crimes and are more personal issues that do not require legal intervention, or many victims report the same crime in different contexts/experiences, being given that they were in the same place and at the same time. when the crime took place. Another problem is the inability to record the personal criminal activities of respondents because it is a victim survey. Additionally, improper question format may invalidate the response, resulting in some crimes not being included in the official report. Additionally, in self-report surveys, people do not admit to illegal acts, and it is less accurate than other sources. Indeed, this information is biased because it can also be altered for political reasons. For example, if a politician needs to demonstrate the reduction of crime in a city, some crimes may be reclassified or ignored. Furthermore, the MTF demonstrates that the number of people committing crimes is higher than that reported in official data, highlighting the inaccuracy of this information.