Under Mexican law there is no distinction as to how privilege operates. The regulation applies as a "professional secrecy obligation", which is different from other jurisdictions.

Yes, notes of interviews and other documents produced during investigations by a professional are covered by privilege, unless disclosure is expressly authorized by the interviewee.

Under the provisions of the General Law of Transparency and Access to Public Information, confidential information is considered to be that which contains personal data concerning an identified or identifiable person. Confidential information will not be subject to any time frame and only the owners of such information, their representatives and authorized Public Officers may have access to it. Confidential information includes banking, fiduciary, industrial, commercial, fiscal, stock and postal secrets, whose ownership corresponds to individuals, subjects of international law or regulated entities when it does not involve the use of public resources.