The article analyses the practice of resolving defense attorneys' requests and complaints of citizens by state expert institutions. The author has assessed whether it is eligible to submit such requests and complaints to expert institutions and whether they are correctly resolved by expert institutions in terms of the current criminal procedure law. The current legislation ensures that defense attorneys may make inquires to various state authorities, local governments, public associations, and other organizations, including state expert institutions. However, some of the defense attorneys' requests received by expert institutions are not legitimate and the attorneys should be denied the requested information. In addition to attorney's requests, expert institutions receives complaints from suspects and accused persons, drawn up with the help of defense attorneys, who must understand that the addressee is not entitled to consider these appeals. Therefore, it is necessary to pay attention to this negative trend that has emerged in recent years.