The arrest of an illegal immigrant for the murder of an Iowa college student is adding fuel to the fire of calls for a revamped immigration policy. Perhaps Americans should look first at enforcement of existing rules.

Cristhian Behena Rivera, 24, is charged with murdering Mollie Tibbetts near Montezuma, Iowa. Rivera has been in this country illegally for at least seven years. He has lived in the Montezuma area for much of that time — and was an employee “in good standing” at a nearby farm.

Which brings up the obvious question: How was Rivera able to become the employee of a business without being detected?

No matter what precautions we take, at least some illegal immigrants will always find ways to come into our country. If they find themselves home-free after getting across the border, the problem will persist.