I want to work in a poison control lab; one of its secondary roles is to carry out tests on samples taken from the dead. These samples are usually fingernails, hair, or some bodily fluids (such as blood or stomach contents). Sometimes tests are carried out on internal organs such as the liver and kidneys. Sometimes these tests are requested in certain cases, such as when there is a need to find out the cause of death, if there is reason to suspect that the deceased was poisoned. I heard before a hadeeth which means that the sanctity of the Muslim when he is dead is the same as when he is alive. So I want to make sure that doing these tests is permissible, or maybe it is permissible in some cases but not others? It would be good if you could tell us the opinions of our scholars such as Shaykh Ibn ‘Uthaymeen, al-Albaani and Ibn Baaz concerning this issue or similar issues?

Praise
be to Allah.

The established principle in the law of Allah, may He be exalted, is that
the body of the Muslim is to be respected in life and in death. Hence the
Muslims are enjoined to protect the bodies of the dead, by burying them,
and not to expose them to any disrespectful treatment. The Prophet
(blessings and peace of Allah be upon him) said: “Breaking the bone of one
who is dead is like breaking it when he is alive.” Narrated by Abu Dawood
(3207) and Ibn Maajah (1616) from the hadeeth of ‘Aa’ishah; classed as
saheeh by al-Albaani in Saheeh Abi Dawood. This is the hadeeth
referred to by the questioner, and this is the wording, not that mentioned
in the question, as far as we know. 

However nowadays there are cases of necessity which require that an
exception be made from what is mentioned above with regard to the dead, so
there was a need for a fatwa to give guidelines on such exceptions. As that
is the case, fatwas have been issued by Fiqh Councils and trustworthy
scholarly organizations stating that it is permissible to dissect the
corpses of deceased Muslims if that is for the purpose of finding forensic
evidence in order to determine the cause of death. This is a matter
concerning which there should be no difference of opinion, because of the
great interests that are served by it. 

That also includes dissecting the corpse in order to find out the cause of
death, even when forensic evidence is not required; rather it is for the
purpose of finding out what disease the deceased was suffering from before
his death, especially if it is a contagious disease. 

There remains a third exception, which is dissecting the body for the
purpose of training medical students and teaching them anatomical facts.
Although doing that serves an important interest, it should not be done to
the bodies of Muslims or to the bodies of those disbelievers who have a
treaty or covenant with the Muslims. Based on that, it is permissible to do
that with the bodies of those who are at war with the Muslims, and
apostates. 

What we have mentioned is the view held by our scholars and shaykhs, and it
is also what has been mentioned in the statements of reliable fiqh
councils. 

Please see the answer to question no. 93820, in which we have quoted the
words of the Council of Senior Scholars, the statement of the Fiqh Council,
and the fatwa of Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on
him). 

Shaykh al-Albaani (may Allah have mercy on him) view is that it is haraam to
dissect the body of the disbeliever unless his family give permission for
that, as is stated on tape no. 809 of Silsilat al-Huda wa’n-Noor. The
view of the shaykh (may Allah have mercy on him) on this issue also includes
the disbeliever who is in a state of war against the Muslims. And he (may
Allah have mercy on him) stated that the Muslims are enjoined to bury him
(the disbeliever) if he is killed on the battlefield. 

Something similar was stated by Shaykh Ibn ‘Uthaymeen (may Allah have mercy
on him), as in al-Fatawaa al-Thulaathiyyah, but he said that the
reason for that is that this comes under the heading of mutilation, which is
haraam, and because there is the fear that they may do the same to the
bodies of Muslims. 

See the view of Shaykh al-Fawzaan in the answer to question no.
107345 

To sum up: 

We follow what is mentioned in Fataawa al-Lajnah ad-Daa’imah (fatwas
of the Standing Committee), the view of the Islamic Fiqh Council, and what
they mention of the conditions and guidelines on this matter. 

And Allah knows best.