IANAL
But over the years I have followed quite a few cases... usually Murder.. but I think some general principles apply to CRIME generally.
AN INDICTMENT... comes early on in the process. BEFORE all the facts are known, or even investigated. PROBABLE CAUSE is sufficient to indict.. in regular court, or behind the scenes in front of a Grand Jury. Also early on... WARRANTS are obtained and property SEARCHED and IMPOUNDED. the "crime scene(s)" are secured...... BEFORE the alleged perp has a chance to hide/destroy evidence. (eg delete and Bleachbit emails). At this stage "The Investigation" is far from over. The suspect and other witnesses are STILL being interviewed and more evidence is being gathered by LE. Also (presumably) the Defense is investigating. The suspect is generally IN PRISON... or perhaps out on bail (if they are not considered a "flight risk"). This investigation may go on weeks, months, or more than a year, before all evidence is fully developed, cross referenced to other people who may be involved etc.
I outline this to contrast the "normal" investigation/Judicial process with what is happening with Hillary case and all the other cases of corruption in DOJ/FBI.
The most basic aspects of investigation and any ensuing Judicial process have NOT been followed... and are still not... and people commenting on this mess don't seem to realize just how CORRUPT the investigation process still is. There are DOZENS of people who could (and should) be indicted.. RIGHT NOW... WARRANTS should have been served and computers etc impounded already... but better late than never.. do it NOW!! There is no requirement to "unravel" every crime involved...all or even most, connections, accomplices, co-defendants etc. The investigation, interviews etc can continue AFTER indictment. WARRANTS need to be served SOONER, rather than LATER... for obvious reasons.... we dont want evidence "lost" among deleted emails about Yoga and weddings.
It is crazy to imagine that as evidence of criminal activity is exposed the thing to do is to name the people, and maybe ask them to appear before Congress (to spin and obfuscate) but not to formally interrogate them, seize documents and electronic records etc. To not even FIRE them.... and certainly not indict them.
Some of them are writing BOOKS... likely using documents that have illegally copied
Jeff Sessions is beyond being just a sleepy old fool not doing his job.... he should be FIRED and held criminally liable for something like "dereliction of duty"