檢jian測ce某mou些xie類lei型xing的de非fei法fa物wu質zhi可ke能neng很hen困kun難nan，因yin為wei有you時shi在zai犯fan罪zui現xian場chang隻zhi會hui發fa現xian少shao量liang的de藥yao物wu殘can留liu，而er這zhe些xie藥yao物wu可ke能neng並bing不bu總zong是shi肉rou眼yan可ke見jian的de。法fa醫yi光guang源yuan可ke作zuo為wei一yi種zhong無wu損sun和he安an全quan的de方fang法fa，用yong於yu檢jian測ce一yi些xie常chang見jian的de毒du品pin或huo毒du品pin殘can留liu物wu，如ru可ke卡ka因yin或huo海hai洛luo因yin。盡jin管guan不bu同tong類lei型xing的de殘can留liu物wu在zai不bu同tong波bo長chang的de光guang下xia會hui發fa出chu熒ying光guang，但dan許xu多duo藥yao物wu殘can留liu物wu在zai用yong犯fan罪zui分fen子zi發fa光guang時shi會hui發fa出chu熒ying光guang。因yin此ci，檢jian查zha人ren員yuan在zai調tiao查zha期qi間jian使shi用一係列波長的光源來檢測藥物殘留非常重要。
dangtedingbochangdekejianguangbeimouzhongwuzhixishou，ranhouwuzhifashebutongbochangdeguangshi，jiuhuifashengyingguang。zhezhongfashedeyingguangqiangdubichanshengyingguangdejifaguangruodeduo，yincishiyonglvguangpianlaizudangweibeixishoudeguang，yibianguanchafashedeyingguang。
Fluorescence occurs when visible light of a specific wavelength is absorbed by a substrate, which then emits light of a different wavelength. This emitted fluorescence is much weaker in intensity than the light that produced it, so filters are used to block out light not absorbed, in order for fluorescent emissions to be viewed.
UV光源產生肉眼不可見但產生可見UV熒光的光。不需要濾光器來觀察UV熒光，盡管可見光通濾光器也適用於該應用。A UV light source generates light which is invisible to the naked eye but produces visible UV fluorescence. A filter is not required to view UV fluorescence although a visible pass filter is also suitable for this application.
上圖：可卡因在紫外光源照射下（透明紫外濾鏡）
上圖：可卡因在藍光445nm照射下， 530BP濾光片拍照
上圖：木質表麵海洛因殘留，在藍光445nm照射下， 530BP濾光片拍照
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