Strange emphasis on 'now'. From wiki, "Mechanic's liens in their modern form were first conceived by Thomas Jefferson, to encourage construction in the new capital city of Washington. They were established by the Maryland General Assembly, of which the city of Washington was then a part.[1] However, it is not likely that Jefferson single-handedly dreamed up the idea.
At the time Jefferson promoted the law, a lien-like privilege already existed in civil law countries like France, the Dutch Republic and Spain, with some laws even tracing their roots to the Roman Empire. And since control of Louisiana had passed between the French and Spaniards, and had largely adopted the French Napoleonic Code, there was a similar privilege concept in that territory."