Officials say Lotto Texas ticket sales have fallen short of covering the last two dozen jackpots.
The latest jackpot of $21 million that hit July 31 outstripped ticket sales by $1.2 million. That forced Texas Lottery Commission officials to dip into a state lottery account to make up the difference.
Such shortfalls have occurred in 14 of the last 24 jackpots, dating back to August 2006.
State law allows the commissionn to shift money from the lottery account.
Lottery watchdog Dawn Nettles says the practice means the lottery's operating account and the proceeds that go to the school trust fund that the lottery benefits are suffering.
But Lottery Commission spokesman Robert Heith says the funding of the jackpots doesn't affect the commission or the school fund.