SALEM -- Drivers caught talking on their cellphones can no longer use the I have to use it for work excuse now.

That loophole in Oregon's phoning-while-driving ban was eliminated, one of dozens of new laws that took effect in the new year.

In addition, people who solicit underage prostitutes now face steep fines, possessing shark fins is illegal, and drunken drivers must get a breath-test machine installed in their car.

More: Oregon cell phone law

Some police officers had complained that it's tough to enforce Oregon's ban on using handheld cellphones behind the wheel because of a vague provision that allows driving and talking if it is necessary for the person's job.

Legislators intended it as an exemption for law enforcement and emergency workers, and some judges interpreted it that way. Others were more lenient and dismissed citations issued to people in other professions.

The new law says only emergency responders and roadside assistance workers like tow truck drivers can use a handheld phone. That's a much clearer rule, said Kevin Campbell, a lobbyist for the Oregon Association of Chiefs of Police.

Our belief is that any law should be as clear as possible so people can obey it and officers can enforce it, Campbell said.

Anyone can hold their phone to call 911, and talking with a hands-free device is still legal. The maximum fine remains $90.

Another law taking effect Sunday will require anyone convicted of drunken driving, even first-time offenders, to get an ignition interlock device installed in their cars. The machines check a driver's breath before the engine will start, and periodically while driving to keep it running.

Interlocks are already required for many drunken drivers, but first-time offenders are often sent to diversion programs instead of jail.

Once you're on diversion, we thought that having this tool would help them keep from re-offending, said Chuck Hayes, a retired state police captain who chairs the Governor's Advisory Committee on Driving Under the Influence of Intoxicants.

Police will get a new tool to crack down on child sex trafficking next year, when the penalty for offering to pay for sex from a minor will be a $10,000 fine the first time and $20,000 for a second offense. Perhaps even more significant, prosecutors won't have to prove that a defendant knew the victim was underage.

More:Sex trafficking in Oregon

The change is part of an effort to combat sex trafficking by cracking down on johns who solicit sex from prostitutes.

In a bid to stop demand for illegally killed sharks, it will be illegal to possess or sell shark fins in Oregon. Shark fins soup is a Chinese delicacy.

More: Multi-state shark fin law

Oregonians who make more than $125,000 a year -- $250,000 for joint filers -- will see some tax relief as top tax rates drop under voter-approved Measure 66. The new rates will be lower than they've been for the last three years but still higher than they were before Measure 66 was enacted.

Other notable changes to Oregon law beginning Jan. 1 include:

-- The minimum wage will go up 30 cents to $8.80 an hour.

-- Most energy efficient appliances will no longer be eligible for tax credits, nor will alternative-fuel vehicles and vehicle conversion equipment.

-- Gift cards that have been used at least once and have less than $5 in value will be redeemable for cash.

-- Filing a false report of child abuse will be punishable by a $720 fine.

-- Computer technicians will be required to tell authorities if they discover child pornography while repairing a computer.

-- Youth in the Oregon foster care system will be eligible for free college tuition.

-- Big commercial trucks will have to shut of their engines while idling to prevent pollution and save energy.

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