Washington • There have been many memorable — and eventually consequential — Supreme Court dissents that affirmed principles that, in time, commanded a court majority. It is, however, rare that a justice’s opinion concurring in a unanimous ruling is more intellectually scintillating and potentially portentous than the ruling itself. This happened last week, when the court dealt with an Indiana civil forfeiture case in which a man’s $42,000 Land Rover was seized by the state as part of his punishment for a drug offense (selling $225 of drugs to undercover police officers) for which the maximum fine is $10,000.