What does “usually” actually mean?

The Genetic Engineering Act (GenTG) also frequently uses vague terms such as "as a rule." For example, for a laboratory area with security level 3, a lock must "as a rule" be installed for entry and exit. Likewise, a hand basin with elbow, foot, or sensor-operated access must "as a rule" be installed in the lock. The text of the law itself already states that a lock may be dispensed with in justified individual cases. "As a rule" means that such a rule can be deviated from in exceptional cases. However, anyone requesting such an exception faces a greater argumentative burden. They must explain why the safety requirements can be met differently in the individual case. In the case of the lock mentioned above, for example, such a lock can be dispensed with if donor and recipient organisms belonging to risk group 3* are being handled. In these cases, airborne transmission does not occur, so certain safety measures, such as the lock, may be dispensed with. Since this is a case-by-case decision, the licensing authority must agree to the deviation from the standard case.