The last big revision of the code of criminal procedure introduced many changes to chapter V of the Code of Criminal Procedure dealing with evidence. These changes also did not circumvent Chapter 22 containing regulations regarding experts, professionals and translators. They are not particularly important, but in conjunction with any changes in the general part of criminal procedure including the rules on burden of proof, probative process, amended rules regarding the benefit of the doubt, probative preclusion and others, acquire special importance. This was also the basic issues of this publication, especially since a criminal trial is not devoted exclusively to sentencing, but rather, above all, reaching the material truth. Now, increasingly, it is necessary to use procedural authorities with the help of experts and specialists. Likewise, the parties cannot remain indifferent to the huge improvement, in all fields of knowledge, and therefore the use of expert assistance becomes a necessity for them.