After erecting 126 miles of fence, illegal traffic fell 90 percent, to 12,847, in 2017. The wall will be based on the eight prototypes recently constructed outside San Diego. Agents say a 30-foot-high fence may not be necessary, 24 feet might be acceptable to save a few dollars. Double fencing is considered the gold standard in border security because it gives border agents time to apprehend illegal immigrants. If they can’t get a job... and E-Verify virtually guarantees it... people won’t come and some will go home,” said one San Diego agent.

Source: Fox News January 30, 2018 16:40 UTC