With more than half the season over, The Wire's first year gets grittier and more relentless in its depiction of a city struggling to stay alive amidst all the corruption, drugs and murder. The eighth episode also introduces at least one element that will be further analyzed in the following seasons (I'm saying this having recently finished watching Season Three).
The teaser is an unusually light affair, as we get a glimpse of McNulty's personal life when he goes grocery-shopping with his young sons. The playfulness turns into something darker, though, when he spots Stringer Bell in the crowd and asks the boys to play "front and follow" with him. In short, the young ones have to follow Stringer - without getting caught - and get his license plate number, which could be very helpful now that the wiretap has been disabled. The downside is that McNulty briefly loses track of the boys, and there's no way Elena is going to like that.
As far as the rest of the investigation is concerned, things get tense when Burrell threatens to shut down the operation by the end of the week and demands that the unit drop a suspect who was carrying money from a known dope safe-house on the grounds that said suspect works for one Senator Clay Davis. On the other side of the law, Avon learns of unorthodox plans on the part of his associate Orlando, Wallace is still trying to cope with Brandon's murder, and the conflict with Omar gets bloodier.
Lessons is an essential Season One episode because it deals - in part - with the vital subplot of drug dealers (and criminals in general) being involved with officially recognized businessmen or, even worse, politicians. Though he is never seen in the episode, this is also the first time we hear of Senator Davis, who went on to become one of the show's most important - and colorful, judging by certain promos - supporting characters. Whether David Simon and Ed Burns had planned this all along is debatable, given there was no guarantee the show would be renewed for a second season, let alone an additional three, but considering their groundbreaking attention to detail, it's hard to think the subplot was introduced by mistake. It's an early sign of Simon's intention to cover new territory later on, and therefore another confirmation of how different The Wire was, and still is, from other television dramas.