It wasn't until he had passed through the third checkpoint towards the main gates did someone finally take notice. It was the last two guards who were having a heated argument. Ironically, they were arguing about the ongoing case when one noticed him coming in. He called the main security office to alert them but the call never went through.
They had tried to open fire at him only for something to prickle their necks and give them an electric shock stunning them. That was the work of an unmanned drone that Riley had asked the Owens family to make for him. It was far better and more perfect for the task at hand as compared to humans.
With the last form of defense overcome, Riley parked the motorcycle and slowly made his way into the building.