Anyway, "being on welfare" doesn't mean "no income to garnish." In fact, statistically most people on welfare are working anywhere between 30-50 hours a week, albeit at one or more part-time jobs.
There are restrictions on what can be garnished legally; for example, a minimum wage employee cannot be garnished --- an employee paid more than the minimum wage can only be garnished some fraction, and it will essentially never be sufficient to repay the bill with interest. If these people are at the poverty line, it is likely that all of their wages will be excluded and they be incapable of being garnished, if not all their wages, then perhaps 95% or so, due to claims of financial hardship this would cause.
They may also avoid garnishment by switching jobs, and ensuring the party holding judgement does not know and cannot discover their employment, or being employed in a cash payment business. For example: waiters/waitresses commonly receive direct payments as tips, which the employer doesn't have access to, therefore is incapable of garnishing.
Do you have a source for that "over 50% on welfare" claim? Because it sounds either dubious, or like a gross misinterpretation of facts.
Number of the Week: Half of U.S. Lives in Household Getting Benefits
rt.com:
More than half of the US population – 165 million of 308 million Americans – is now dependent on the state in some form. Of these, 107 million Americans rely on government welfare, 46 million seniors collect Medicare and there are 22 million government employees.
The number of Americans on welfare have increased from 97 million to 107 million since President Obama took office, according to research by Ranking Member of the Senate Budget Committee Jeff Sessions. The number of Americans on food stamps during the president’s term has risen by more than 14 million.