The secret is out: you can get a COVID-19 vaccine in certain states if you know where to look.

But if you're planning on taking a "vaccine road trip," you might want to speed up your plans. Some states are making a U-turn on their guidelines, amid fierce backlash.

Since News 12's investigation began, some states have changed course and others are considering more changes.

DATA: Searchable table of state requirements in the U.S. (list also available at bottom of article)

Reaction has been pouring in since our first investigation aired last week - not only from travelers, but from decision-makers across the country who are facing increased scrutiny over their policies.

While the lifesaving doses are still limited in the Hudson Valley, more and more people across the tri-state are 'hitting the road' in search of shorter wait times elsewhere.

One week after the News 12 team started digging deeper on vaccine tourism, there was a major policy reversal in the state of Idaho. There were previously no guidelines barring out-of-staters from traveling to Idaho to get vaccinated - and News 12 found out that nearly 5,000 doses went into the arms of people who don't live there.

The Idaho Department of Health director says everyone there now needs proof they live or work in the state.

There are still 20 other states that allow you to schedule an appointment - regardless of your residency status. It includes popular winter getaways such as Arizona, Colorado, South Carolina and even California.

A lesser-known spot - with a much shorter drive - is now the top destination. State data shows Pennsylvania has vaccinated more than 100,000 non-residents since January.

Some lawmakers are now advising against vaccine tourism - even though it's perfectly legal.

"Whenever you flee the state, you know, there's the potential of more infection. So therefore, I would avoid travel, I would avoid leaving the state," says Assemblyman Nader Sayegh.

Americans aren't the only ones hoping to jump the line.

Foreign and domestic travelers jetting to Florida in droves led to fierce criticism and new residency requirements in the Sunshine State.

But before the rules changed, nearly 80,000 people from across New York and the world flocked to Florida to get vaccinated, including a popular TV host from Mexico.

Conversations are also underway in other hot spots such as Arizona on whether or not to change course. Then there are states like South Carolina, which opened its doors and has no plans to shut them.

Those who live in New York, Connecticut and New Jersey do not have to notify their home state after taking a vaccine road trip, but people should still keep their vaccine card handy the next time they travel.