犯罪实验室

The primary purpose of the crime lab is to employ investigative techniques utilized in the recognition, 集合, 保存, and analysis of physical evidence. 学生 who complete lab classes in the CRIM department, will get some insight into what it’s like to properly collect and interpret evidence, and then to present that evidence in court. The classes that utilize the criminalistics laboratory are designed to stimulate student interest and develop capabilities for law enforcement services.

With the existing technology that we have 在犯罪实验室, students can successfully perform ballistic analysis (e.g., comparisons of bullet striations, firing pin comparisons, 等.), collect latent prints on various surfaces, collect and analyze trace evidence, 玻璃的分析, 血液飞溅分析, 犯罪现场文件, 仅举几个例子.

• 弹道学分析: The crime lab is well-equipped with tens of thousands of dollars worth of new up-to-date technology. We have six comparison microscopes with digital capabilities. Five of them are ballistics microscopes used for ballistics analysis; one is used for hair/fiber analysis. 另外, the lab is equipped with fifteen compound microscopes that are typically used for trace analysis.
   
• Fingerprint 保存, classification, and identification: The crime lab is fully equipped with the proper equipments for collecting and analyzing latent 指纹. This segment of the crime lab focuses on collecting latent 指纹 using physical and chemical developers. The crime lab utilizes a variety of physical developers (e.g., regular magnetic and non-magnetic volcanic powders, as well as fluorescent magnetic and volcanic powders) for developing latent prints on non-porous surfaces as well as chemical developers (e.g., iodine, DFO, ninhydrin, silver nitrate, Hungarian red, acid yellow 7, amido black, 等.)表示多孔，(e.g., cyanoacrylate, small particle reagent, 等.)混合面. In addition to various methods of collecting and preserving latent prints, 在犯罪实验室, students learn classification and identification of fingerprint patterns.
   
• 跟踪证据: Besides the fifteen compound microscopes, the crime lab is equipped with the Alternate Light Source (MCS-400 crimescope), 24 crime scene uv (455nm) flashlights, and several shortwave uv laboratory edition flashlights. 利用msc - 400, students learn how to search and identify a variety of trace evidence, 包括体液, 识别身体瘀伤, 咬痕, 指纹, 其他隐藏证据, 等.
   
• 法医摄影: This includes equipments necessary for 犯罪现场文件. The crime lab is equipped with eleven digital cameras and 犯罪现场文件 accessories (e.g., macro focusing rails for macro photography of psychical evidence, crime scene markers and crime scene tape, various types of forensic scales, 特殊相机滤镜, 三脚, 等.) that students use to practice and learn the techniques of properly documenting various crime scenes. The lab has the necessary equipments for preparing students, as future crime scene investigators (CSI), to record visual and legal evidence at the scene of a crime. 在犯罪实验室, students learn to use specialized low-light photographing techniques such as ultraviolet and infrared photography, 荧光摄影, 用光作画, and timed exposure photography; all of which are commonly used techniques in law enforcement investigations.
   
• 测谎仪设备: What makes the crime lab at ISU unique is the new state of the art law enforcement version polygraph machine. Our crime lab is perhaps one of the very few university labs that have an advanced polygraph machine. We have added this instrument to the lab two semesters ago.