After years of investigation, three weeks of trial and millions of dollars spent pursuing Barry Bonds, federal prosecutors were back where they started Thursday, deciding whether to try to prove Bonds' records were built with steroids and lies. On Wednesday, the jury that was to finally decide whether Bonds deceived a grand jury in 2003 when he denied knowingly using performance-enhancing drugs instead left the issue deeply unresolved. The panel of eight women and four men convicted Bonds of obstructing justice but deadlocked on the three charges at the heart of the government's perjury case, including two counts of lying about the use of steroids and human growth hormone. Now, prosecutors must weigh whether to spend still more money, and staff time, conducting another trial.