Forceful Interrogation Technique

This jutsu is used by performing the hand seals and then placing the users dominant hand onto the targets forehead. The user then uses their chakra to embed a key phrase into the persons mind(which also leaves a special seal on the persons brian), when that key phrase is said the person will be force to speak the truth. This made that person an involuntary spy, if this jutsu is combined with the Memory Retrieval Method the person can have their memory of this jutsu removed so they will carry on like nothing happened.

Development
Being it's creator Keter had to work on developing the technique, at first the technique would activate if anyone said the phrase but after one month of development he managed to make it so that it only activated through physical contact. The user then says the phrase and the seal reads the chakra of the person if it matches the seals creator then the jutsu activates(All this is done instantaneously).