Good point.
However intrusion detection is just one facet of securing our border.
Let’s frame this along the line of home / commercial security.
1. Deterrent physical barrier.
2. Breach detection.
3. Immediate security response.
4. Intruder apprehension, punishment / consequences.
A fence is a physical deterrent which discourages entry. It can be breached, no doubt. However, it becomes a platform for detection, too: seismic, acoustical, light laser beam, electrical disturbances to a physical fence provides immediate alarm and location of entry breach.
A drone hovering overhead is somewhat of a deterrent. However it can’t be everywhere and may have visual coverage lapse at night, or during cloudy / rainy days.
This 2015 border security plan does not address the need for adequately manning the border to provide deterrence and timely intervention to apprehend intruders.
The border patrol has been warning us that they are out manned, and have been often instructed to stand down during a breach.
Finally, punishment, ie: imprisonment and prompt deportation is not part of this new secure border bill. Obola and Holder have significantly curtailed border enforcement and illegal immigrant prosecutions.
Our US gov’t under the direction of republi-c rats, has made it clear they want this continued border illegal immigration crisis to continue, no matter the risk and damage to our country’s economy and culture.
Drones will hardly address the border immigration crisis.
I’m pretty sure an army of drones could spot them coming and flag them for pick up in time to be caught on US territory. That’s the breach detection aspect. Then another army of helicopters could provide the response and the agents inside could apprehend and arrest them until they could be carted away for processing, detention, and deportation as necessary. If that process is carried out successfully a few hundred or thousand times, word would get back to those trying to cross and provide the deterrent.