Method for estimating a risk of relapse of addictive behavior of an individual, said addictive behavior being related to exposure to alcohol, said method comprising: • providing a predetermined schedule for said individual to conduct exposure tests, said exposure test comprising performing a determination of said individual's exposure to alcohol, said predetermined schedule comprising multiple points in time with time-slots within which said exposure tests should be conducted; • requesting said individual to conduct exposure tests according to said predetermined schedule; • collecting, with a measurements device, data from conducted exposure tests, said collected data comprising measurements of said individual's exposure to alcohol and time-points when said exposure tests were conducted; • transmitting said collected data from said measurement device to a central server unit; • storing said collected data in said central server unit; • evaluating a behavioral pattern related to said individual's compliance to said scheduled exposure tests, based on a determination if said exposure tests are systematically shifted within acceptable time-slots so as to widen the unmonitored time for consuming alcohol in a physically undetectable manner; wherein said behavioral pattern is evaluated based on a Maximum Time Between Exposure Tests, MTBET, where MTBET is the maximum time of all "time between exposure tests" that have been collected during a specific period of time, where "time between exposure tests" is the time between two adjacent exposure tests that both are conducted according to said predetermined schedule; • estimating a risk of relapse based on said evaluated behavioral pattern and said measurements of said individual's exposure to alcohol, wherein an elevated MTBET is interpreted as elevated risk for relapse of addictive behavior; and • if said estimated risk is greater than a predefined level, transmitting a message to a third party. • providing a predetermined schedule for said individual to conduct exposure tests, said exposure test comprising performing a determination of said individual's exposure to alcohol, said predetermined schedule comprising multiple points in time with time-slots within which said exposure tests should be conducted; • requesting said individual to conduct exposure tests according to said predetermined schedule; • collecting, with a measurements device, data from conducted exposure tests, said collected data comprising measurements of said individual's exposure to alcohol and time-points when said exposure tests were conducted; • transmitting said collected data from said measurement device to a central server unit; • storing said collected data in said central server unit; • evaluating a behavioral pattern related to said individual's compliance to said scheduled exposure tests, based on a determination if said exposure tests are systematically shifted within acceptable time-slots so as to widen the unmonitored time for consuming alcohol in a physically undetectable manner; wherein said behavioral pattern is evaluated based on a Maximum Time Between Exposure Tests, MTBET, where MTBET is the maximum time of all "time between exposure tests" that have been collected during a specific period of time, where "time between exposure tests" is the time between two adjacent exposure tests that both are conducted according to said predetermined schedule; • estimating a risk of relapse based on said evaluated behavioral pattern and said measurements of said individual's exposure to alcohol, wherein an elevated MTBET is interpreted as elevated risk for relapse of addictive behavior; and • if said estimated risk is greater than a predefined level, transmitting a message to a third party.