At the conclusion of each case, the culprits almost always confess their guilt to investigators that would most assuredly not be the people interviewing them. This helps to wrap up the case in a Scooby Doo like manner for the general viewing public. See more
When the CSIs and detectives want to "bring in" or "pick up" someone for questioning, they are usually located instantly. That might work if they had a consistent schedule they followed faithfully every day, but there are few people who do that. However, with the invention and advancements of GPS and smartphones, it's not entirely unsurprising that locating suspects is shown to be achieved with relative ease. See more
[looking at evidence from a murder case
I can't wrap my head around it, Mac. You get up, you go to work, see the people that you know, you talk, you laugh. You're living your life, then suddenly, boom. It's just over. Just like that, and you never even saw it coming.