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The  development of rapid non-destructive hand held devices for testing for food authenticity has been growing at a pace in recent years. US researchers have developed the MasSpec Pen technology, which is placed on the food and connects with a mass spectrometer that employs a solvent droplet and gives an answer in 15 seconds.The MasSpec Pen has been used to authenticate grain-fed beef, grass-fed beef, venison, cod, halibut, Atlantic salmon, sockeye salmon, and steelhead trout. Statistical models developed with the Lasso method using a training set of samples yielded per-sample accuracies of 95% for the beef model, 100% for the beef versus venison model, and 84% for the multiclass fish model. In addition, feasibility testing for classifying venison and grass-fed beef samples adulterated with grain-fed beef achieved prediction accuracies of 100% for both classifiers using test sets of samples.

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