The present disclosure is directed to a system for sensor-based objective determination. An example apparatus includes memory, instructions, and processor circuitry to execute the instructions to at least compare time-synchronization data between a first signal and a second signal, the first and second signals received in response to a detected contact between a first participant and a second participant in an event, wherein the first signal is received from a first sensor operably coupled to the first participant, the first sensor to measure at least one first physical parameter of the first participant while the first participant is engaged in the event, and wherein the second signal is received from a second sensor operably coupled to the second participant, the second sensor to measure at least one second physical parameter of the second participant while the second participant is engaged in the event, and determine, based on (a) the time-synchronization data, (b) the at least one first physical parameter, and (c) the at least one second physical parameter, whether the detected contact between the first participant and the second participant exceeds one or more thresholds corresponding to a rules-based infraction associated with the event.