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Facts
Scientific knowledge is based on empirical evidence gathered through scientific experimentation and investigations
In certain cases in could but in a general term no it cannot, poorly collected evidence could contaminate it or even if obtained wrong could be thrown out and not be used as evidence that is why there are procedures to be followed.
1. so that your body grease etc does not contaminate the experiment, or the evidence 2. so that the chemicals do not injure your skin.
Observation,experimentation,reasoning,implementation
"Contaminate" is not an adjective that applies to verbally given testimony or written statements. It is applied to physical evidence of the type usually found at a crime scene or seized later in support of the investigation.
There are literally hundreds of textbooks written on this subject. A question this broad cannot be answered in this venue.
i have contaminate the food by putting my dirty hand on the food.
No, biased statements are not supported by evidence.
Investigations of what? The best response to this question I can provide is that they follow the evidence.
Evidence Collection
As of my last update, there isn't definitive evidence to label former Brazilian President Luiz Inácio Lula da Silva as prejudice. His rhetoric and actions have been a mix of progressive and controversial, with some accusations of corruption and alliances with divisive figures. It's important to examine his statements and policies in context to form an informed opinion on his stance on prejudice.
prejudice applies to excluding a person of their abilities or judging someone without evidence
Most statements made by counsel can be considered by jurors as evidence. In some cases, the judge will instruct you whether you should listen and consider this as evidence or not.
In a trial of co-conspirators, statements that have been made in the execution of the conspiracy or for a common purpose have been admissible. A confession to a magistrate that has not been shown to be unduly influenced or coerced in any way. Statements made under statutory compulsion. Admissions by conduct, vicarious admissions, executive statements, statements without prejudice, admission of statements that are not full confessions, person in authority and the onus of proving a confession was given freely
Trace evidence in criminal investigations was shown by Dr. Edmond Locard in the early 20th Century.
The parts of scientific investigation are identifying a research question or problem, forming a hypothesis, gathering evidence, analyzing evidence.