1. What are steroids?
There are many types of steroids, and most of them are natural and required by animals, plants and fungi to survive. The scientific definition is a terpenoid lipid characterized by a carbon skeleton with four fused rings, generally arranged in a 6-6-6-5 fashion. Common steroids include estrogen, testosterone, and cholesterol. Technically, cholesterol is a sterol, which is a combination of steroids and alcohol. The former two are in a category called steroid hormones. These steroids include the sex hormones, corticosteroids (topical steroids are used for skin rashes, etc), and anabolic steroids. Anabolic steroids are the ones used by athletes because their main purpose is to increase muscle and bone synthesis. Because they are related to the testosterone sex hormone, they also have effects of maintaining masculine characteristics, such as growth of vocal chords and body hair. Anabolic steroids were first identified and synthesized in the 1930s.
2. What is the legal status of anabolic steroids?
Most countries classify steroids as controlled substances, which means that they are illegal to produce, distribute, possess and use without written prescriptions from authorized medical officials. These countries include the United States, Argentina, Australia, Brazil, Canada, the Netherlands (NL), and the United Kingdom (UK). However, they are readily available over the counter in Thailand and Mexico. Hence the underground availability of them in the U.S.
However, the status of anabolic steroids is recent considering its 1930s identification. They had no legal status prior to the 1980s and were common in many sports, including football and bodybuilding. It was not until the Ben Johnson controversial Olympic victory that they were placed under the Controlled Substances Act in the United States.
3. When were steroids banned in Major League Baseball?
1991. There is a huge misconception that steroids were not illegal in Major League Baseball (MLB) before 2004. This is completely false. The truth is that they were officially banned in 1991 when Commissioner Fay Vincent sent a memo to all teams and players that illegal drugs, including steroids are illegal. 
“This prohibition applies to all illegal drugs and controlled substances, including steroids or prescription drugs…“
The exact same memo was resent by the MLB office in 1997.  The reason 2004 is used as the official year was because the rule was not enforced from 1991 until the pressures of Congress forced testing to become official in 2004.
4. Who is responsible for allowing steroids to become a problem from 1991 to 2004?
This is the ultimate question. Although guilty players have gotten most of the blame for the problem, logically they were only the end result of the problem. The commissioner and owners turned the other way because the lockout of 1994 had caused baseball to drop precipitously in popularity. An historic home run race between Mark McGwire and Sammy Sosa seemed the perfect antidote for low ratings. The players’ union, in trying to protect their players’ privacy and rights, instead seemed like they were protecting cheaters instead of looking out for the interests of innocent players. The players who used were at fault because they cheated and lowered the integrity of the game. However, it is unfair to fully blame players who felt pressured to take PEDs after seeing a culture that created unnatural stars. It seems, at least for the moment, that Arod fell into this camp. Innocent players should also shoulder some of the the blame because almost all chose the silent route when questioned if their was a problem in the game. Instead of looking out for the interests of the game, they chose to stick to union lines and protect cheating players that indirectly hurt themselves. It’s hard to fault fans that wanted to see more offense, especially home runs, simply because baseball without all the hits and runs can be construed as boring. Finally, testing for steroids and especially HGH was simply not at a point yet that MLB was comfortable with.
5. What notable players have been tainted by steroids, HGH or other performance enhancing drugs (PEDs)?
Barry Bonds, Alex Rodriguez, Mark McGwire, Jose Canseco, Roger Clemens, Jason Giambi, Miguel Tejada, Rafael Palmeiro, Andy Pettitte, Benito Santiago, Gary Sheffield, Lenny Dykstra, Chuck Knoblauch, David Justice, Mo Vaughn, Ken Caminiti, Matt Williams.
This is only a list of notable players. Tens of second tier players have also been outed by the Mitchell Report. Another 103 are on the list of 104 anonymous players who tested positive in MLB’s steroids survey in 2003. Alex Rodriguez is the first name to be leaked from that list.
6. Should players tainted by steroids allegations be allowed into the Hall of Fame?
This question won’t be answered for at least a decade. There’s a reason why retired players have to wait five years before becoming eligible for the Hall of Fame. This is to allow any attachments and emotions to the player to subside before making a more objective decision. However, the criteria for entering the HOF has always changed with the times and generations. As much as people question the statistics of the Steroid Era, baseball has always allowed questionable players into the HOF. Until the whole steroids influence is fully understood, statistics of all players who played during this era cannot be fully appreciated. At this point, the steroids players are simply the ones that have been caught. To assume someone is clean because they haven’t been caught is naive. It is getting to a point that either all players are treated equally in the Steroid Era (whether they were caught or not or were clean) or that no one gets into the HOF. However, this question won’t be answered for a decade and perceptions may change through the years.
7. What paths have players accused of steroids and PEDs taken when ‘outed’?
Ranging from complete silence or denial to complete admittance and regret, players have had a wide range of reactions when cornered by PEDs allegations. The ones that have been most apologetic have had most success in resuming their playing careers, even if it meant a tainted legacy. Those that have shown completely no remorse or have put the blame on non-believable entities have been vilified by the public. The paths taken by the most notable players include, from strongest denial to strongest admittance:
-Complete denial and knowledge of taking steroids, even when confronted by overwhelming evidence and federal investigations, continue to stick to their stance (Barry Bonds, Roger Clemens)
-Complete silence and avoidance of issue (Mark McGwire)
-Complete denial then silence when overwhelming evidence surfaced (Ralphael Palmeiro, Sammy Sosa)
-Vague admittance and apology when caught (Jason Giambi)
-Full admittance and regret but with excuses such as injury or peer-pressure (Andy Pettitte, Alex Rodriguez)
-Full admittance and then assisted officials with information about steroids, suppliers and other players (Jose Canseco, Jason Grimsley)
Notes: This Q&A is not official and is simply my personal interpretation and understanding of the steroids scandal. I will add more questions and answers as they come up. If you would like to see a Q&A added on here, please add it in the comments section and I will gladly update the post.