Mu Sochua, a member of the Sam Rainsy Party, was fined for remarks made in connection with a lawsuit against Prime Minister Hun Sen.
In its attempt to curtail the crime, the US has helped Cambodia strengthen its laws.
The law allows foreigners to own residential property such as apartments, so long as they are above the ground floor.
Some nations support the release of alleged perpetrators from detention or seek reduced punishment from the government.
Cambodia is now drafting a law restricting the sale of acid and outlining punishment for perpetrators of the attacks.
The draft law should also add provisions for a public campaign to educate people on first aid techniques for acid burns.
The Supreme Court on Wednesday delayed a defamation hearing of opposition lawmaker Mu Sochua, who was found guilty by a lower court.
Exactly 40 years ago, the war photographer Sean Flynn rode out of Phnom Penh on a motorbike, accompanied by photojournalist Dana Stone.
Demonstrations in Cambodia sometimes lead to injuries among participants.
Upset villagers say they were pushed from their land by Ly Yong Phat’s Phnom Penh Sugar Company.
Local rights groups on Tuesday urged the government to quickly establish a law against acid attacks.
World Bank officials are negotiating with the government to find a resolution for residents of the Boeung Kak lake development.