A process for manufacturing an excretion monitoring system is provided that comprises: providing, on a liquid-impervious material roll, a plurality of radio frequency (RF) tags in an arrangement each of the plurality of RF tags is configured to respond to a signal at a different frequency; repeating, along length of the liquid-impervious material roll and throughout the entire length of the liquid-impervious material roll, the providing the plurality of RF tags; cutting in a manner nondeterministic to the RF tags the liquid-impervious material roll into sections of a predetermined length such that there contains approximately the plurality of RF tags in each section; and constituting the excretion monitoring system by using one of the sections. Contact of a RF tag with an excreted fluid modifies a response by that RF tag to a signal at the corresponding frequency.