Your research topic can be based either on an observed phenomenon or facts.
Let us say you have noticed the different legislation in Norway and the USA when it comes to using biological criminal evidence in the investigation of criminal acts. You are particularly interested in environmental crimes, such as stealing eggs, hunting and catching birds in danger of extermination. So you want to examine whether differences in legislation within this field have any consequences for solving these crimes, and if so - what are they?
Your research topic can for instance be defined like this: Different legislation in Norway and the USA - what are the consequences of this for the police's to use biological criminal evidence in the investigation of environmental crimes?
Don't forget to give a brief account of the basic outline of the separate legislations, as well as their differences. If the paper becomes too extensive, you have to choose the most important aspects.