When taken in mainland France, the "baccalauréat" material is the same for all students in a given stream. The secrecy surrounding the material is very tight, and the envelopes containing the exams are unsealed by a high-ranking school officer (usually a principal or vice-principal) in front of the examinees only a few minutes prior to the start of the examination. The procedure is the same for each subject, in each stream. Students usually have an identification number and an assigned seat. The number is written on all exam material and the name is hidden by folding and sealing the upper right-hand corner of the examination sheet(s). That way, anonymity is respected. The correcting staff is usually a member of the teaching staff in the same district or, at a larger scale, in the same "académie". To avoid conflicts of interests, a teacher who has lectured to a student or group of students cannot grade that exam. Also, to ensure greater objectivity on the part of the examiners, the test is anonymous. The grader sees only an exam paper with a serial number, with all personally identifying material stripped away and forbidden from appearing, thus curbing any favoritism based upon sex, religion, national origin, or ethnicity.