On: Scores for adults are dropping on tests of basic skills

[nradov]

3M may be a bit high but there has been an enormous increase in the illegal alien population over the past few years. As with any criminal activity it's difficult to get accurate numbers.

https://www.newsweek.com/illegal-immigration-costs-us-billio...

As to whether that could impact scores on this particular test, that seems highly speculative. We don't have any data to support such a claim.