LITTLE ROCK, Ark. (AP) — The Latest on Arkansas' plan to execute inmate Jack Greene and possibly others (all times local):

3:15 p.m.

After putting four men to death in April before one of its lethal injection drugs expired, Arkansas says it is able to conduct two more executions.

A death penalty expert says it appears the state may have found a reliable source for midazolam. Jen Moreno of the Death Penalty Clinic at the University of California Law School said Friday the small amount and cheap price suggest Arkansas can now buy drugs on an as-needed basis.

In 2015, the state spent $24,226 for large stockpiles of midazolam, vecuronium bromide and potassium chloride. Last week, Arkansas spent $250 for 40 vials of midazolam. Arkansas on Thursday began taking steps to execute Jack Greene.

Prison officials wouldn't comment on its supplier, but said it was "confident" in its ability to carry out death sentences once a warrant is issued.

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2 p.m.

A death penalty expert says Arkansas may have found a reliable source for an execution drug.

The state that put four men to death in April says it has enough drugs to execute two more inmates. Jen Moreno of the Death Penalty Clinic at the University of California Law School said Friday the small amount and cheap price suggest Arkansas can now buy drugs on an as-needed basis.

In 2015, the state spent $24,226 for large stockpiles of midazolam, vecuronium bromide and potassium chloride. Last week, Arkansas spent $250 for 40 vials of midazolam, which is enough for two executions.

Arkansas on Thursday began taking steps to execute Jack Greene. Another inmate whose appeals are exhausted has a clemency request pending.

Prison officials did not return requests for comment Friday.