People familiar with the investigation told the newspaper the Department of Justice is seeking information about whether Alere covered patient copays for certain tests, and whether the company paid illegal kickbacks to doctors that ordered the tests. Alere confirmed to the WSJ that it has received subpoenas from the DOJ, but said the matter is "not material," arguing the government claims represented a small fraction of the company's overall revenue in 2015. The new investigation could add another kink in Abbott's acquisition of Alere.