Why Macquarie expects this ASX 200 dividend stock to keep outperforming

S&P/ASX 200 Index (ASX: XJO) dividend stock ALS Ltd (ASX: ALQ) has a lengthy track record of outperforming the benchmark index.

In late morning trade on Friday, shares are up 0.1%, changing hands for $16.45 apiece.

If you’re not familiar with ALS, the testing…