Being a bonafide Texas gal having only lived in Arkansas a little over two years, I'm not privy to the do's, don'ts and LAWS the state. So, I literally just found out that I may have been breaking the law and didn't know it. Perhaps you are too. 

Did you know that in the state of Arkansas it's against the law to drive without headlights while it's raining? So, a good rule of thumb is to make sure your headlights are on every time you turn your windshield wipers on.

According to the website your mechanic, the state of Arkansas rules for headlight use is as follows.

Headlights

Headlights must be in use from 30 minutes after sunset until 30 minutes before sunrise.

Headlights must also be in use when you cannot see more than 500 feet ahead of you.

Headlights are required when windshield wipers are turned on.

High Beams

High beams must be dimmed when approaching traffic is within 500 feet.

High beams must also be dimmed when following within 200 feet of another vehicle.

High beams should not be used in fog, rain, or snow.

Texas laws are a little different.

Headlights

Headlights must be in use from 30 minutes after sunset until 30 minutes before sunrise.

Headlights must also be in use when you cannot see at least 1000 feet ahead of you.

High Beams

High beams may not be used when driving on lighted roads.

High beams are also not allowed when driving in fog, heavy rain, snow, sleet, or dust.

High beams must be dimmed when approaching traffic is within 500 feet.

High beams must also be dimmed when following within 300 feet of another vehicle.