Yes. Observation, i.e. systematic watching of one or more persons, their presence or behavior, or of things, places or determined events, implying the use of technical means other than interception or tracing of communications lasting over a period of one month in case of offences punished by imprisonment of a maximum of one year. In practice, includes shadowing, photographic filing, video surveillance and GPS tracking. Exceptional measure to be duly motivated, limited in duration unless prolonged. Alternative measure: Room surveillance (A.56, please note that this alternative measure may also consist in installing a technical device in public places for the purpose of real-time audio recording, video recording or electronic data capture).