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I am not super familiar with the show CBS show Criminal Minds or the character Penelope Garcia, but it seems like she is a former hacker who is in an IT security job. If you are interested in IT security, you should definitely get formal training in it. The job market for this field is hot, but employers are looking for people with some significant experience. Many colleges and universities are now offering degrees in cyber-security, and you can also get certifications in specific areas of IT security. I hope this helps, and best of luck.