The inevitable disclosure doctrine is a concept rooted in common law that allows a plaintiff to prove trade secret misappropriation by “demonstrating that defendant’s new employment will inevitably lead him [or her] to rely on plaintiff’s trade secrets.” PepsiCo., Inc. v. Redmond, 54 F.3d 1262, 1269 (7th Cir. 1995). Thus, the defendant threatens misappropriation merely by holding the trade secreted information in his or her head while working for a direct competitor. States take varying approaches to this doctrine either fully allowing its use, allowing its use with limitations, or prohibiting its use.