Guidelines for law enforcement officers in dealing with street demonstrations have been clarified in two announcements issued by the Prime Minister's Office.
The demonstration law is in line with the 2015 Public Assembly Act introduced in mid-August this year to specifically deal with street protests, it said.
The office's announcements outline what equipment officers are allowed to use and clarifies procedures which rally organisers must follow before staging demonstrations.
The law provides a list of 48 items of crowd-control equipment which law enforcement officers are allowed to use during operations. Protection gear includes helmets, body shields, knee pads and shin guards while offensive equipment includes batons, tear gas, smoke bombs, net guns, stun guns and rubber bullets.
It also clarifies procedures that organisers of a public assembly must take before proceeding.
They are not required to seek permission but must inform authorities concerned of planned gatherings 24 hours in advance.
Police have urged the public to keep in mind that the new law is in place.
National police chief Chakthip Chaijinda said the legislation gives clear guidelines about holding peaceful demonstrations and asked the public to strictly comply.
"Some people may not be aware the new law has taken effect," Pol Gen Chakthip said.