crime scene investig csi spectrum electricity experiment investigation laboratory meters science wire analyse burglar crime criminal detective finger fingerprint inspect investigate lens magnifier magnifying murder mystery police bible book candle light read reading spectacle study table campus library Mexico Mexico City students studies UNAM university agency baker street balconies balcony flowerbed Holmes house London museum Sherlock windows clue footprint lead marked murderer print robber robbery scene trace accident asphalt body chalk contour crime scene dead death drawing evidence figure forensic form ground kill law line marker outline profile proof saving silhouette street victim violence abstract background black crook graphic identification identify illustration individual ink isolated lines mark pattern personal skin texture unique vector white blood hit homicide