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But they have not been so strict with themselves.

A bill to make lawmakers report their own trades within 90 days has gained support of only a handful of members.

"We have no problem making strict rules for others, but we have a difficult time doing it for ourselves," said Rep. Brian Baird (D-Wash.), a co-author of the bill.

The shortcomings of the disclosure system keep a true picture of a member's wealth from public view -- when more lawmakers are investing and Congress is exerting greater control over companies through bank bailouts, executive pay rules, stimulus spending and financial regulation.

Disclosure requirements for members of Congress are permissive and confusing, with few rules for how they must identify their assets and a lag of a year or more before they must report.

Since 1978, Congress has relied on annual disclosure forms that allow the public only a glimpse of members' investments but are supposed to act as a check on potential conflicts and corruption.

The time lag in disclosure makes it difficult to determine whether members are casting votes that might affect their current holdings. Disclosure forms containing lawmakers' financial activities during early 2009, as they negotiated details of the $787 billion stimulus package, will not be available until later this week, 16 months after the bill passed.

The reports are often incomplete, incorrect or illegible. Lawmakers' assets routinely appear without explanation. Because the information is initially filed on paper forms, the public cannot electronically search or analyze them for patterns.

Ethics rules allow members and their senior staff to report their investments in wide ranges, making it impossible in most cases to determine profits and losses.

Those ranges extend from $1,000 to $15,000 on the low end, and from $50 million and above at the top. Lawmakers can also report multiple trades in a batch without giving a breakdown.

The Washington Post, using financial disclosure data from 2004 to 2008 that were compiled by the nonprofit Center for Responsive Politics, found that one in five transactions listed by lawmakers did not include dates of when they bought or sold stock or property.