Los Gatos Research, Inc. proposes to develop a lightweight, compact, rugged, near-infrared gas-sensing spectroscopy instrument to accurately measure the abundance of various gases indicative of the presence of life. These gases include carbon dioxide, ammonia, and methane. This instrument will be the first low-cost, remotely operable all fiber-based Integrated Cavity Output Spectroscopy sensor capable of measuring gases such as carbon dioxide, oxygen, and methane with sufficient precision to indicate the presence of biological activity on non-Earth bodies, particularly Mars and Europa. The proposed prototype sensor includes the novel use of hollow photonic crystal fibers, which further enables accurate measurement of even small samples of gas (approximately 1 microliter). The project will also leverage Los Gatos Research's prior work developing rugged, autonomous gas sensors for extreme environments that NASA is currently using.