write into sentences: Checking for caffeine: -mostly all samples follow the sample peaks -peaks similar to theophylline's -unspiked & spiked samples are similar but not exactly the same -peak heights are different but peak times are the same -1st spiked had higher peaks than the 1st unspiked sample -2nd spiked is barely higher than the unspiked -3rd looks the same other than the 2nd major peak is biggest in the unspiked sample