Janitorial work doesn't exactly require a college education, or even the ability to speak English, and the usual training, if any, involves nonsecu-rity related issues such as which kind of cleaning product to use for different tasks. Generally these people don't get an instruction like, "If someone asks you to let them in after hours, you need to see their company ID card, and then call the cleaning company office, explain the situation, and wait for authorization."