As bullets flew around the Westgate Shopping Mall in Nairobi, Kenya, at the weekend, a familiar name surfaced once again. Samantha Lewthwaite, the widow of a 7/7 bomber and a woman wanted by both British and Kenyan security services, was reported as being involved in the mass shootings. Who is the woman known as 'The White Widow'?

More and more police are being armed with Taser stun guns prompting questions about whether they are always used in the right circumstances. Campaigners point to the controversial cases of partially-sighted Colin Farmer, Tasered in the back when police mistook his white stick for a Samurai sword. And 23 year-old Jordan Begley who died after being Tasered by Greater Manchester Police in July this year.

But how much do we really know about how dangerous these stun guns are compared with alternatives like CS spray, batons and police dogs? And is the training adequate? Melanie Abbott is given rare access to police officers as they undertake their final Taser assessment. And she'll hear demands for more research into the medical impact of being Tasered.

Producer: Sally Abrahams.

The death of banking intern Moritz Erhardt this summer has led to soul searching in The City. Although the exact cause of his death has not yet been confirmed, reports that he worked three all-nighters in a row has shed light on a fiercely competitive world of 120-hour weeks that leads many to illness, addiction and depression.

What led the young would-be banker, and others like him, to work such long hours? Phil Kemp speaks to current and former bankers about the face-time culture that forces them to stay at their desk regardless of their workload and the tactics they use to help stay awake, including the use of illegal prescription drugs.

Doctors describe the toll that pushing the body to these limits eventually takes, and interns tell Phil about the big decision they will have to make between huge pay-packets and a life outside of the Square Mile.

Producer: Lucy Proctor.

There's a battle for influence taking place over fracking. Should companies in the UK be drilling for the trillions of cubic feet of shale gas lying thousands of metres below the surface of the earth, and hydraulically fracturing (fracking) the wells to get it out?

Demonstrators have already voiced noisy opposition to the plans in the West Sussex village of Balcombe, citing fracking-induced earthquakes in Lancashire and leaks and contamination of water sources near fracking sites in the United States.

The Prime Minister, David Cameron, and the Chancellor, George Osbourne, have both championed fracking saying it will lower energy prices and lead to better energy security for the UK as it has done in America. But is fracking dangerous, and will it be the silver bullet for energy prices? Wesley Stephenson looks at the evidence.

Private investigators are coming under increasing scrutiny themselves - with the latest controversy surrounding the work they carry out for companies.

Adam Fleming investigates how PIs take advantage of cameras, GPS tracking devices and legal grey areas to carry out surveillance on individuals for insurers and other clients.

He also meets the people who accuse the industry of dirty tricks, as the government announces the introduction of licences for investigators.

Phil Kemp travels to Gibraltar to investigate what's really happening on The Rock.

Critics dubbed the controversial Liverpool Care Pathway the "road to death" and accused the NHS of killing off thousands of elderly patients. Supporters say it has helped terminally ill people have a peaceful and dignified death. The campaign against the Liverpool Care Pathway was fuelled by countless stories in the newspapers of patients being deprived of food and water and heavily sedated. Following the publication in July 2013 of an independent review, the government announced that the Liverpool Care Pathway will be phased out in NHS hospitals in England. But some medical professionals fear the baby has been thrown out with the bathwater. In this programme, Helen Grady looks at the back story - how and why the Liverpool Care Pathway was rolled out, the opposition campaign and the likely impact for patients of the Pathway's demise. She talks to relatives of patients who were on the pathway, doctors and palliative care experts.

Just a few weeks before the World Athletics Championships in Moscow, two top sprinters tested positive for performance enhancing drugs. Tyson Gay is the fastest man this year over 100 metres and Asafa Powell is the former world record holder. They were the biggest scalps since Ben Johnson was stripped of his Olympic gold medal in 1988. Since then sophisticated testing programmes have been set up and systems to monitor athletes' whereabouts are in place.

In this week's Report, Simon Cox examines why so few cheating athletes are being detected. He speaks to the key figures who have drawn up the most damning assessment of the anti-doping regime and the failure of individual national bodies to properly address the problem. And he travels to the German laboratory who developed a test for the latest banned drug which can still be bought legally in the UK.

Following the death of three reservists, Adam Fleming investigates whether deaths and injuries like these can be avoided. Three members of the Territorial Army have died after attempting a special forces selection course in the Brecon Beacons on one of the hottest days of the year.

People who have gone through the process in the Welsh mountains believe that the new recruits were marching from point to point, carrying heavy rucksacks in a gruelling test of their fitness and navigation skills. They would have been carrying water, emergency flares and GPS tracking devices.

The Police, the military, the Health and Safety Executive and the local coroner are investigating but events are still shrouded in mystery. In this edition Adam Fleming asks what precautions would have been in place and investigates the safety of military training.

The Unite trade union has been accused of trying to manipulate the process for choosing the Labour Party's candidate to be the Falkirk MP in the next general election. Police are now investigating allegations that the UK's largest trade union signed people up to be members of the Labour Party, without their knowledge. In the wake of the Falkirk debacle, Labour leader Ed Miliband signalled that the historic links with the unions must change.

But what happened in Falkirk? Hannah Barnes travels to the Scottish constituency to find out whether the selection process was hijacked by outside forces.

Producer: Charlotte McDonald.