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Oklahoma Supreme Court justices considered arguments Tuesday that challenged the constitutionality of four bills passed during this year’s legislative session.

The legal challenges throw into question millions of dollars of state revenue that fund government agencies.

This Week in Oklahoma Politics, KOSU's Michael Cross talks with Republican Political Consultant Neva Hill and ACLU Oklahoma Executive Director Ryan Kiesel about the dire situation at the Department of Corrections according to Director Joe Allbaugh, the state faces a lawsuit by car dealers over a tax increase on the sale of new motor vehicles as well as a suit by Republican candidate for Governor Gary Richardson over other issues in the budget passed last month by lawmakers.

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Gary Richardson, a Republican candidate for Oklahoma governor in 2018, is filing a lawsuit disputing the constitutionality of three House Bills recently signed into law.

The bills add new fees onto electric or compressed natural gas vehicles, automobile purchases, and some tax return filings.

After seven years of growth, the auto market is seeing weakness.

In April, sales were off by 4.7 percent. That's despite the continued robust sales of highly profitable SUVs and trucks. That's no big deal for an industry that just got off of two record seasons, but not so for investors.

The pain is being felt across the auto world.

Most car buyers don't do more than the most perfunctory test drive of new or used cars. But with so much new technology and features in today's cars and trucks, a thorough test drive is more important than ever.

One of the benefits for owners of electric and hybrid cars is that they are quiet. While that is attractive for the driver, it poses a danger to pedestrians. But the U.S. government on Monday finalized new rules requiring so-called "quiet cars" to make alert beeps when traveling at low speeds.

It has been a common belief that low-emissions vehicles, like hybrids and electric cars, are more expensive than other choices. But a new study finds that when operating and maintenance costs are included in a vehicle's price, cleaner cars may actually be a better bet.

The cars and trucks we drive are responsible for about a fifth of greenhouse gas emissions in this country. That's why Jessika Trancik, an energy scientist at the Massachusetts Institute of Technology, decided it was time to take a closer look at vehicle emissions.