This part of the Texas border story needs more amplification:

“There are serrated metal plates that look like circular saw blades between each buoy.”

Photo caption in linked article: "Swimming under the barrier is not an option. It’s anchored to the shallow water with thick cables and concrete bases. And there are serrated metal plates that look like circular saw blades between each buoy to deter anyone from climbing over it."

Who puts SAW BLADES in the middle of a fast-flowing river navigated by civilians, in an area where many people, including children and families, attempt to cross and often drown?

From Texas Public Radio.