Legal analysis: there is no defense in criminal cases, so of course you can write your own written materials and give them to the detention center or public security personnel as your own confession. The defense is a document that the defendant, counterclaim, appellee and respondent reply and refute the contents of the complaint, counterclaim, appeal and retrial application according to the facts and laws within the statutory time limit, and it is one of the most frequently used languages in the complaint. The right of defense is a right given to the parties in the defendant position by law. They have the freedom to deal with the right of defense, and they can reply or be silent. A criminal case is a public prosecution case, and there is no defense.
Legal basis: Article 32 of the Provisions of the Supreme People's Court on Evidence in Civil Proceedings, the defendant shall submit a defense before the expiration of the defense period, stating his opinions on the plaintiff's claim and the facts and reasons on which it is based. Although the judicial interpretation uses the word "should", there is no provision on the legal consequences of not submitting a reply, so this provision has become an advocacy clause in operation. The defendant's failure to submit a defense still does not affect his rights.