Forensics is an ever evolving science with a lot of possibilities acquire deeper knowledge about by different forensics schools or forensics colleges.
With the ever increasing importance of computers and digital media for both personal and corporate users, the number of crimes involving electronic data is now higher than ever. Thus, only data forensics experts can search computers for electronic evidence, make digital investigations, recover lost data and provide technical expertise. To count only a few of the judicial cases for which data forensics is useful, we ought to mention breach of contract, intellectual property theft, discrimination, sexual harassment and so on. Therefore, it is not that difficult to understand why data forensics is so important in the legal system.

A normal type of computer investigation cannot detect or extract bits of information remained after deletion. Data forensics will normally examine files that are hidden, deleted or even discarded, as well as fragments or file left-overs. Although it often seems impossible to recover data or to identify the criminal process, this search for the needle in the haystack is pretty successful. What relevance does such evidence have for legal cases? Well, practice has already proved it that even the course of a trial could be changed by the retrieval of deleted e-mail messages for instance.

The challenges that data forensics expert have to face are enormous. The applications do have far-reaching applications, but the work to extract digital evidence is strict and exhausting. Sometimes the necessary information is buried deep in the corporate electronic system, or sometimes, even if it is physically identifiable it is difficult to separate and analyze extensively, off line. Moreover, for a successful data collection, data forensics has to protect the extracted elements by duplication so that  the information is preserved and not altered and spoiled during the process. Lots of skills, strict standards and great caution are needed for each of these steps and only real pros can succeed.

A data forensics expert should be contacted immediately, once a breach in the security system or a criminal act against electronic media is detected. This will enable the appropriate and cost-limited data collection in the best conditions possible. Moreover, it is false to assume that data forensics only applies to computer hard drives as the main systems that can store information; there are cases of criminal action involving, USB devices, CDs, DVDs and even voice mail systems. Even photocopy machines include hard drives and the scanned or copied documents can be afterwards retrieved from them.