An approach for allocating computing resources based on a confidence level associated with responses to queries is provided. An injector introduces a particle into the electric field. The first electrode and the resistive layer collectively include a first lip region that extends a first distance beyond the first opening. Other embodiments are also disclosed. Photographs from the visible spectral range can be consulted in the computed-based detection. In particular embodiments, the media content products can be secured without requiring the store workers to insert each and every media content product into a security box or security tether system.