System for determining the presence of a substance of interest in a sample

A system for detecting the presence of a substance of interest in a sample, the system comprising:

• a spectrometer;
• and
• a server for analyzing spectrometry data, wherein the server comprises a processor configured to operate at least one convolutional neural network (CNN) configured to process images;
• wherein the spectrometer is configured to obtain array data representative of the sample, and the server is configured to obtain spectrometry data for the sample based on the array data;
• in response to obtaining the spectrometry data, the server is configured to:
• operate a first CNN to process the spectrometry data to obtain a first CNN output;
• apply a mask to the spectrometry data to obtain masked data;
• and
• operate a second CNN to process the masked data to obtain a second CNN output;
• wherein the system is configured to determine if the substance of interest is present in the sample based on both the first CNN output and the second CNN output.