Gov. Paul LePage vetoed another dozen bills late Friday, most because they were sponsored by Democrats.

LePage lashed out at Democrats last month for opposing his initiatives, pledging on May 29 to veto all Democrat-sponsored bills until they passed his plan to eliminate the state income tax. Since then he has vetoed at least 22 bills, 20 of which were sponsored by Democrats, though the governor didn’t always cite partisan reasons in explaining his vetoes.

LePage’s veto letters gave that pledge as the reason for nine of his vetoes Friday. Of the other three, LePage vetoed one dealing with protecting homeowners from water system failures because he thought it would be ineffective and another because it would have required a study by the Department of Inland Fisheries and Wildlife.

LePage said he doesn’t think lawmakers should require studies by the executive branch.

The third non-party veto was a line item veto of increased scholarships for early college or career and technical education programs. LePage said the effectiveness of the scholarships should be examined before the amounts are increased.

The bills vetoed by LePage because they were sponsored by Democrats included measures that would allow fuel oil truck drivers to bleed a home heating oil burner, making it easier and cheaper to restart the boiler if a homeowner ran out of oil, and one to ban standardized tests of students before the third grade. Other vetoed bills dealt with updating rules for veterinary practices; allowing liquor salespeople to provide alcoholic drinks at tasting events; amending child abuse reporting standards; changing the rules on school construction financing for regional school units; implementing a recommendation to apply competitive bid rules to grant awards; improving transit services; and increasing consumer protections.