Comprehensive comparisons of in situ measurements from a cone penetrometer-deployed laser induced fluorescence (LIF) petroleum, oil, and lubricant (POL) sensor with traditional field screening methods were performed. Operational procedures were developed to facilitate comparison between methods and across multiple sites. Using a field screening detect/non-detect criterion, agreement between sensor measurements corresponding to the sampled interval and the laboratory analytical measurements on those samples was better than 85 percent. Comparison between measurements from the two accepted analytical techniques, on splits of the same sample, was only slightly better. We conclude that the LIF-POL sensor, deployed from a cone penetrometer, provides significant advantages for subsurface field screening of POL-contaminated sites. The LIF technique offers the advantages of rapid, in situ, real-time measurements, coupled with increased data density, not possible with traditional screening methods.