The number of people caught trying to cross the U.S.-Mexico border without authorization dropped last month, according to new U.S. Customs and Border Protection data.
The CBP's numbers show about 42,500 people were apprehended at the southwest border in June. That's down 18 percent compared to May.
Some officials are crediting the lower numbers to the Trump administration's zero-tolerance immigration policy. But experts say that might not be the case.
As the founder of the pro-immigrant nonprofit Border Angels told NBC, the amount of apprehensions at the southwest border has actually been historically low for years now. And CNN notes that since 2000, there's usually been a decline in border crossings from May to June, but the size of the drop changes every year.
