By John Knox BBC Scotland political reporter

The girl herself? Her parents? Her teachers? The drug dealer? Her neighbours? Social workers? The police? The politicians who run the community where she lives? The politicians who run the society where she was brought up?

Drugs were on the political agenda after an 11-year-old took heroin

If no one is to blame, do you just let her carry on? And if they are all to blame, what percentage of the blame do you apportion to each one?

These are the questions which have been troubling Holyrood this week. And it is no hypothetical case.

The 11-year-old girl, from the east end of Glasgow, was taken to hospital last week where doctors discovered she had been smoking heroin regularly for at least two months and had bought her supplies in �10 bags from a dealer at a local shopping centre.

It is thought there are more than 50,000 children in Scotland living in households where there is at least one drug addict.

As part of the thrashing around at question time on Thursday, First Minister Jack McConnell announced "a review" of whether more of these children should be taken away from their parents and cared for by the local authority.

"The needs of the children have to come first," he told MSPs. "We have to give them the best possible start in life."

Drug education

It signals a major shift away from the philosophy that children are always best left with their parents.

The Scottish National Party's Nicola Sturgeon pointed out that the government's �1 million programme of drug education in schools had been halted in 2004.

"It's a serious and fundamental flaw in the Scottish Executive's drugs policy," she said.

But Mr McConnell said that was misrepresenting the issue. In fact every school had a drug education programme and the money was now mainstreamed into the overall budget.

The Conservative leader Annabel Goldie said the executive was sending out mixed messages to children on drugs.

"If an 11-year-old girl asked the first minister about taking heroin, would he give her information designed to help her 'Know the Score' (in the words of the executive's anti-drugs campaign) so that she could decide for herself, or would he tell her how dangerous drug abuse is?"

MSPs rejected a call for "presumed consent" for organ donation

The first minister said the two things were the same.

From being tough on drugs to being tough on crime, the executive got its Police Bill through its first stage this week.

All the parties, except the Socialists, backed this catch-all legislation.

It doubles the sentence for carrying a knife. It allows for troublemakers to be excluded from football grounds. It imposes a 28-day period of notice for holding a sectarian march.

It also establishes an independent police complaints commissioner. And it strengthens the role of the Drug Enforcement Agency.

It will become the Scottish Crime and Drug Enforcement Agency, an independent police force, some have likened to the American FBI.

This has drawn criticism from the existing chief constables who fear it will erode their local power and expertise.

Organ retention

Less contentious was the Human Tissue Bill which was passed unanimously on Thursday afternoon.

This seeks to increase the number of organs available for transplant and to clarify the rules on post-mortems and organ retention.

The bill makes it clear that when someone has registered as an organ donor, after death relatives will not have a veto.

Liberal Democrat John Farquhar Munro argued for a system of "presumed consent" favoured by the transplant doctors.

He said only 25% of people actually got around to putting their names on the NHS donor register, despite the fact that the vast majority of people want to donate their organs.

Rowdy debate

The doctors estimate that 50 lives could be saved every year in Scotland if we moved to "presumed consent".

But the minister Lewis Macdonald said such a system was flawed, because it allowed relatives to object on the grounds of distress.

He argued more organs would become available for transplant under the bill because relatives could not object where patients had made their wishes clear before their death.

Tommy Sheridan's tax bill was defeated at Holyrood

Mr Munro's amendment was defeated by 87 votes to 18.

On Wednesday, we had a rowdy debate over the Socialists' bill to abolish the council tax and replace it with a local income tax, set nationally and bearing down heavily on the rich.

It was defeated by 94 votes to 12 but not before Tommy Sheridan had accused the SNP and the Liberal Democrats of selling out on their commitment to a local income tax.

In the committee rooms, MSPs were shocked to learn that 3,000 NHS patients may have been infected with hepatitis C through blood transfusions but not all of their records could be traced.

Health Minister Andy Kerr promised the health committee he would look into it.

Later an executive spokesman explained that a "look back" exercise had been carried out in 1995.

Food inquiry

It had found that 379 blood donors had been found to have hepatitis C.

A total of 858 patients had been infected through blood transfusions. Of these 515 have since died, 223 were tested and received counselling and 120 could not be traced.

At the environment committee, an inquiry has begun into the food industry - in particular the price of milk.

The environment committee is looking at the price of milk

Milk is typically selling in the supermarkets for about 50p a litre. But only 18p goes to the farmer, less than the cost of production.

A total of 700 dairy farmers in Scotland have gone out of business in the last five years, though the remaining 1,200 are keeping larger herds of cattle.

MSPs were keen to find out where the profits are going.

Farmer John Cummings from Stranraer told the committee: "It's not in my pocket, so it's split between the Wisemans of this world and the Tescos of this world."

The NFU man, John Withers, pinned the blame on the supermarkets.

The supermarkets in turn blamed the falling demand for liquid milk and denied trying to put marginal dairy farmers out of business.

Saturday Night Fever

One of the interesting issues that emerged was that Westminster's competition policy is apparently preventing the formation of powerful farmers co-operatives, such as those found in France and the US, to counteract the power of the supermarkets.

The committee's report will come out in the spring.

There wasn't a lot to laugh about at Holyrood this week.

Even the members' debates on Wednesday and Thursday evening were about the serious matters of childhood obesity and the decline in our village halls.

But wait, speaking of village halls, we had our equivalent this week, with a Danceathon in the Holyrood Hotel in aid of Malawi. A total of �1,300 was raised.

I'm told the best dancers were Andy Kerr, Trish Godman and Johann Lamont, though the first minister did his best with a Wednesday night version of Saturday Night Fever.