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Arkansas’ efforts to execute eight death row inmates in 11 days this month has refocused attention on the death penalty.

Since peaking in 1999, executions in the US have been gradually declining amid controversy over whether lethal-injection methods are humane.

Capital punishment is still legal in 31 US states. But as the drugs needed for execution get harder to come by, states are getting creative.

Here’s how we got to this point:

Opposition to the death penalty is rising …

In 1994, Gallup found that 80% of Americans supported the death penalty. Fast-forward to today: A poll from October shows support has fallen to 60%.

… and more states are putting executions on hold

Those are in addition to the 19 states and the District of Columbia, which have outlawed capital punishment. Since 2009 alone, Connecticut, Delaware, Illinois, Maryland and New Mexico have abolished the death penalty. Nebraska repealed it in 2015 but reinstated it last year.

But capital punishment isn’t dying

Not by a long shot. In just the last six years, 17 states have executed 260 inmates. Three states – Texas, Florida and Georgia – account for more than half of those.

The most common method? Lethal injection

Lethal injection is the primary means of execution in all 31 death penalty states. In 1982, Texas became the first state to execute an offender via lethal injection. Since then, the United States has carried out 1,444 executions, and only 171 have relied on another method.

But the drugs are drying up …

There are 61 women on death row across the country, according to the Death Penalty Information Center, making up only 2% of the 3,125 inmates on death row across the country.  Take a look at all the women sentenced to death in the United States.  Source: Death Penalty Information Center
Lethal injection explained (2014)
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Lethal injection initially required a three-drug cocktail: The first (sodium thiopental or pentobarbital) puts the prisoner to sleep, the second (pancuronium bromide) brings on paralysis, and the final agent (potassium chloride) stops the heart.

In 2010, European drug manufacturers began banning exports of the cocktail ingredients to the United States. The following year, concerned about the use of sodium thiopental in executions, Illinois-based Hospira stopped making the drug, and Denmark-based Lundbeck banned US prisons from using its pentobarbital.

The United Kingdom also introduced a ban on exporting sodium thiopental, and the European Union took an official stance in 2012 with its Regulation on Products used for Capital Punishment and Torture.

… forcing states to seek new cocktails

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Lethal injection at the Supreme Court in two minutes
02:04 - Source: CNN

Death penalty states began looking for alternatives. Among them: procuring the drugs from alternative sources, devising a one-drug method, employing other drugs such as midazolam or propofol, and using controversial compounding pharmacies to manufacture the drugs.

This has spurred a cascade of lawsuits

Such lawsuits saw a significant uptick in 2014. That’s the same year numerous executions, all employing midazolam, were widely considered botched. In Ohio, Dennis McGuire gasped and convulsed for 10 minutes before dying. In Arizona, Joseph Wood snorted and gulped for air as he died over a period of two hours. In Oklahoma, Clayton Lockett writhed for 43 minutes before succumbing to a heart attack.

After each of those cases, states issued holds on capital punishment while their processes were reviewed. Attorneys for death row inmates in several states have also used these botched efforts to challenge the constitutionality of their clients’ executions.

But the examples keep coming. In December, witnesses said Ronald Bert Smith Jr. heaved and coughed for 13 minutes during his execution in Alabama.

Now, states are looking at alternatives

In 2014, Tennessee said that when lethal injection drugs can’t be found, the state can use the electric chair. The next year, Utah successfully passed legislation to reintroduce firing squads. And this month, Arkansas planned to kill 8 men in quick succession before its supply of lethal-injection drugs expires. But a federal judge halted the executions. The state plans to appeal.

CNN’s Brandon Griggs contributed to this story.