It’s behind the WSJ paywall, but the opening graphs say it all:

The U.S. agency in charge of regulating offshore oil drilling is carrying out its investigation of the Gulf of Mexico oil spill in a “completely backwards” manner, and lacks sufficient guidelines and inspectors to police the industry’s operations in the Gulf, the acting inspector general of the U.S. Interior Department is expected to tell a congressional panel Thursday.
U.S. officials should also consider setting new ethics rules aimed at limiting the influence of oil and gas industry representatives over regulators, according to remarks prepared for delivery Thursday by Mary L. Kendall, the acting inspector general of Interior.

An excerpt from the pay section of the piece:

Ms. Kendall says the agency’s regulations governing accident investigations are also sparse, limited to “five brief paragraphs.”
“As a result, the MMS is bound by [U.S.] Coast Guard regulations, which are comprehensive, but in my view, completely backwards, gathering evidence via public hearing, rather than developing evidence to culminate in a public forum,” according to Ms. Kendall’s testimony.
Ms. Kendall’s remarks are likely to increase pressure on the Obama administration and Congress to overhaul and tighten regulation of offshore oil rigs.