It depends on the kind of job. Some jobs do not require drug testing at all, although the current trend is more employers want these tests. I'd think, though, the question is not about benefits, but about employment-- meaning, if a company wants drug-free workers, they won't hire without clean results and therefore, "benefits" becomes a moot point.
one for which those with higher incomes receive lower benefits or no benefits at all
There is a time limit after entry into the country before you would be eligible for any public benefits. But if you do receive public means tested services, your sponsor (which all green card holders are required to have) would be liable for the dollar amount of any such services you received. This means that if you take means tested health benefits, the government will make the sponsor pay the medical bills.
Social Security benefits are not "means tested" - i.e., there is no limit to the amount of property or other assets you may own. Millionaires receive Social Security benefits. Are you referring instead to Supplemental Security Income?
Maybe
Most insurers will require initial testing of all employees and random testing of all employees thenceforth.
Yes, US Department of Transportation regulations require that anyone trained as a HazMat employee Hazardous must be tested for comprehension.
the employees took the food home and tested it on their babies
No. Receipt of means-tested public benefits does not disqualify anyone from being a sponsor. However, means-tested public benefits cannot be accepted as income for the purposes of meeting the income requirement.
no
The amount you can have in savings while receiving benefits varies depending on the specific benefits you receive and the regulations in your country. In many places, there are limits on savings for means-tested benefits, often ranging from a few thousand to several thousand dollars or pounds. Exceeding these limits may affect your eligibility for benefits. It's important to check with your local benefits office or their website for precise information regarding your situation.
A prediction that can be tested is: "Increasing the amount of fertilizer will lead to higher crop yields." This statement can be tested by conducting an experiment where some crops receive more fertilizer while others receive less, and then measuring the yield of each group to see if there is a difference.
The additional state pension in the UK is not means-tested. It is based on your National Insurance contributions and is separate from means-tested benefits.