Phan Imex was supposed to build 10 buildings to house evicted residents and built eight instead.
Witnesses said security guards for the TTY Company opened fire with AK-47s.
Escapees climbed over the walls or jumped the metal gates of the Prey Speu Social Affairs Center Wednesday in full view of observers.
In her letter to the court, shared with reporters, she said she had paid the fine in full, from reductions in her parliamentary salary.
Thirty-eight people remain in unlawful detention after they were seized by authorities as they protested outside City Hall this week.
The demonstrators were seized Wednesday, where they had demanded the courts release eight representatives arrested earlier this month.
Around 300 families lost their homes in the Jan. 3 forced eviction of Borei Keila.
An estimated 20,000 Cambodians are trafficked throughout the region each year.
Cambodia and other Asean countries have adopted a draft of a charter for human rights that will see rigorous debate next month.
The site, at Phnom Bath mountain, is 50 kilometers outside the capital and lacks clean water, electricity, and health care facilities.
Moek Dara is accused of abusing his post to gather hundreds of thousands of dollars in bribes and organizing drug trafficking.
According to Adhoc, there are more than 15,000 prisoners nationwide in a detention system that cannot hold them.