But the U.S. EPA has rejected that idea, calling it impractical and difficult to enforce.
However, as well as being difficult to enforce, the proposal faces resistance from the industry.
We were left holding a useless piece of paper, and it's difficult to enforce a contract there.
Users must be at least 14 to register on MySpace, although such age restrictions are difficult to enforce.
Chile's experience suggests that even if they were desirable in theory, capital controls may be difficult to enforce in practice.
Critics say that conditions may not improve even after the standards are in place, because these could prove difficult to enforce.
While ratification and implementation of the OECD Convention came about quite quickly, several countries found it difficult to enforce in practice.
Even proponents acknowledge that smoking restrictions could prove difficult to enforce, however.
Although South Africa has recently introduced laws against sexual relations between pupils and staff, they were still proving difficult to enforce, Ms Jewkes said.
These rules look fine on paper but are difficult to enforce.
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Addiction specialists say exclusion lists are difficult to enforce without a requirement that casinos check gamblers' IDs, and they need to be accompanied by treatment programs.
If a claim is rejected, claimants are asked to leave, but it is difficult to enforce this after such a long and settled period in this county.
The Indian manoeuvre shows the sanctions against Iran are proving difficult to enforce because of Asia's reliance on Iranian crude, according to international consultancy group Global Insight.
Although the Iraqi government has made commitments to enshrining the rights of religious minorities in the country's new constitution, the lack of security makes these difficult to enforce on the ground.
Those parts of a statute most difficult to enforce, whether because they are expensive or because they lack a concentrated interest group as champion, will be the parts that fall into disuse.
Even this modest agreement has proved extremely difficult to verify and enforce.
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Thus, in re-writing the Code, Congress should be mindful of the fact that each additional loophole, deduction and tax expenditure makes it more difficult for the IRS to enforce the Code fairly and efficiently.
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Simply stated, it is very difficult for governments to impose and enforce confiscatory tax rates when investors and entrepreneurs can shift their economic activity to jurisdictions with better tax policy.
It is a testament to how difficult it can be for the U.S. to enforce international sanctions, even among countries that appear to be natural allies in the effort to deter Iran.
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Yet, even this relatively modest CW agreement has proven extremely difficult to verify and still more problematic to enforce.
While there were already laws in place barring members of Congress or the executive branch from profiting from nonpublic information that they learn in the course of their duties, it was extremely difficult for those at the Securities and Exchange Commission to enforce those laws.
The register in New Zealand was difficult to keep up to date and there was a question of what you would do to enforce it, Mr Hunter argued.
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