Which of the following actions is prohibited for someone without a security services contractor license?

Acting as a private security consultant is indeed prohibited for someone without a security services contractor license because this role typically involves providing professional advice or services related to security measures, risk assessments, and the protection of individuals or property. Such duties require a thorough understanding of security laws, practices, and ethical considerations, which are governed by the regulations and standards set forth by the Texas Department of Public Safety's Private Security Bureau (PSB).

Without the appropriate license, an individual is not legally recognized as qualified to offer consultancy services in this specialized field, which can expose clients to potential risks and legal liabilities. The need for proper licensing ensures that consultants operating in Texas adhere to required standards of training and competency, which are essential for maintaining the integrity of security services provided to the public.

When comparing this option with the others, conducting background checks, offering consulting for security systems, and providing training programs may fall under different regulatory requirements or may be permissible under certain circumstances without a full security services contractor license, depending on the specifics of the services being rendered.