In the Republic of Croatia, the impact of ‘CSI’ series on the judicial system (the so-called CSI effect) has not been investigated so far up to now. The aim of this study was to examine the impact of the CSI effect on the operation of the judical system in the Republic of Croatia. An online survey among 104 lawyers was conducted. The results were the following: respondents believe that crime TV series did not influence the way investigations are conducted, their behaviour, court decisions and the way they communicate with the public. They feel that public expectations have changed in part due to crime TV series, but they also think that they have not influenced their behaviour or the decision-making of the courts. They also believe that crime TV series have partly influenced criminal behaviour and state that such series also partially simplify the ways in which the police conduct investigations. Regarding the way of understanding the operation of the judicial system, the respondents believe that crime TV series make it difficult to understand the Croatian legal system and do not accurately portray court proceedings. Respondents stated that crime TV series do not accurately show the availability and value of clues collected at the crime scene. We can conclude that the general attitude of the respondents is that crime TV series have no influence on themselves or the courts, but they believe that such series still leave a mark on the public which, under their influence, creates a misperception about the way the legal system works and functions.