With neo-liberal theories, state regulatory function has been challenged, and notably in the field of technologies. Therefore, a number of questions are raised pertaining to the capacity of persons who have suffered injuries or harm from technoscientific activities to obtain reparation through judicial process. Following an exposé of the main theoretical elements of the debate about the relationship between normativity, democratic values and economy, the authors analyse the perception by judges of science and technoscientific risk through the scrutiny of some Québec and Canadian decisions in respect of the relationship between scientific evidence and legal standard of proof. Hence, they discuss the problem of the weight and importance of scientific evidence within the judicial process and also refer to the terms of the debate already engaged in the United States.