I've been working crime scenes as a technician for 3 years and finally decided to sit for the CSI certification. I'm about 6 weeks out from my test date and wondering how much the written exam reflects actual field work versus textbook knowledge. The study materials feel like they're covering a lot of theory I never use on the job.
My practice scores are hovering around 68-72% and I've read you need at least 75% to pass. Doing about 90 minutes of study every night after work. The evidence collection and chain of custody sections feel solid, but the forensic photography standards are tripping me up - I keep second-guessing the technical specs.
Has anyone here taken it recently? I'm curious whether the actual exam leans more toward photography and documentation or more toward the lab analysis side of things. I don't want to over-invest in sections that barely show up.
Also - any tips on whether the scenario-based questions are multiple choice or written response? That's going to seriously change how I prep for the last few weeks.
Your 68-72% practice scores are fine for 6 weeks out. I was scoring 65% at that stage and passed with a 77%. The real exam felt slightly easier than most practice materials I used.
I passed mine last fall with an 81%. The photography section is worth more than people expect - probably 20% of the questions touched on documentation standards. Don't skip it.
The scenario questions are all multiple choice, which is a relief. But they're tricky because two answers always look almost identical.
Just make sure you know the difference between class and individual evidence cold. That distinction shows up constantly and I'd say I saw it reframed maybe 8-10 different ways across the exam.
Chain of custody made up a big chunk when I sat for it in 2024. If you're solid there that's a good sign. The photography stuff is honestly just memorizing a checklist - it clicks fast once you drill it a few times.
Honestly I almost pulled the plug on this whole thing about three weeks in. The study materials felt like overkill, and I kept thinking there's no way half of this shows up when you're actually processing a scene. I was wrong, but not in the way you'd expect. The written part leans way more on the textbook side than I wanted it to. They want the proper terminology, the chain of custody steps in order, the photography stuff, ABO blood typing, the legal admissibility questions. Field instinct will get you maybe 40 percent of the way and then you hit a wall of definitions you've never had to say out loud in three years on the job.
What turned it around for me was just grinding practice questions instead of rereading chapters. That's it. I'd bomb a section, look at why, and do it again the next day. Six weeks is plenty if you're honest about your weak spots. Don't trust your experience to carry you, but don't panic either, because the second you start seeing the patterns in how they ask things it gets a lot less scary. I went in convinced I'd fail and passed comfortably. You'll be fine, just put in the reps.
I passed mine back in April after being a tech for almost four years, so I feel this. Honestly the written is heavier on methodology than you'd expect from field work. The stuff that actually tripped people up in my cohort was crime scene reconstruction logic, not the physical evidence stuff we do every day.
What clicked for me was drilling scenario-based questions instead of just reading through manuals. I found this csi/questions/crime scene reconstruction 3 set about two weeks out and it exposed gaps I didn't know I had. Six weeks is enough time if you're not starting from zero, which you aren't. Focus on the "why" behind procedures, not just the steps.