Direct reflective lighting is used to minimize shadows within the evidence. However, this method creates very high contrast and does not show the dimensional shape or texture of the evidence. Also, the light source may need to be diffused to prevent hot spots.

The culture secretary became emotional as she offered her "heartfelt thanks and admiration" to journalists working for the BBC, ITV and other news outlets "who are risking their lives to bring us unbiased and accurate news from a live war zone".

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Obliquelighting Forensics

The principal purpose of this Guide is to provide an investigative outline of the tasks that should be considered at every explosion scene. They will ensure that proper procedures are used to locate, identify, collect, and preserve valuable evidence so that it can be examined to produce the most useful and effective information-best practices. This Guide was designed to apply to explosion and bombing scene investigations, from highly complex and visible cases, such as the bombing of the Alfred P. Murrah Federal Building in Oklahoma City, to those that attract less attention and fewer resources but may be just as complex for the investigator.

UK media regulator Ofcom is currently investigating RT for 27 potential breaches of its broadcasting code. The watchdog has the power to revoke a broadcast licence, but any action is likely to take weeks.

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Oblique lightexample

Since most laboratory photography is made with steady burning lights (quartz lamps, photoflood lamps, fluorescent lamps, etc.) it is relatively easy to choose the best lighting method for photographing a specific item of evidence. All you need to do is try different lighting methods while looking in the camera's viewfinder, and select the method that gives the best results. The following lighting methods are effective for photographing various evidence subjects.

Sir Nick Clegg, the former UK deputy prime minister, is now vice president of global affairs at Facebook's parent company, Meta. He tweeted on Monday, external: "We have received requests from a number of governments and the EU to take further steps in relation to Russian state-controlled media.

Transmitted lighting is used for photographing transparent or translucent subjects. It is effective in photographing evidence such as a fingerprint on a drinking glass.

UK Culture Secretary Nadine Dorries, who has described the channel as "Putin's polluting propaganda machine", said she hoped it would not return to UK screens.

Oblique lighting is commonly used when photographing impressions, tool marks and certain types of fingerprints. A very low oblique angle of lighting can be used to photograph dusty footwear impressions and indented writing.

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"It is my absolute position that we will not stop until we have persuaded every organisation, based in the UK or not, that is the wrong thing to do to stream Russian propaganda into British homes."

The BBC has also confirmed it has launched two new shortwave radio frequencies to make sure its news was available in parts of Ukraine and Russia after a TV tower in Kyiv was bombed and internet services restricted.

"Due to the ongoing war in Ukraine, we're blocking YouTube channels connected to RT and Sputnik across Europe, effective immediately," a statement from Google Europe said, external earlier this week.

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Oblique lightphotography

"The BBC's executive team were meeting [on Wednesday] and they have decided to stop all content licensing to Russian customers."

Obliquecontrast

"Given the exceptional nature of the current situation, we will be restricting access to RT and Sputnik across the EU at this time."

In response to the channel's removal, RT deputy editor-in-chief Anna Belkina said: "Media regulation should be divorced from geopolitics, led by independent bodies and expert regulators, ensuring diversity in news and information sources is protected.

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Oblique lightexamination

"As part of a concerted effort and discussions, Russia Today is no longer streamed into British homes, either by TV, Sky, Freesat or Freeview," she told the House of Commons on Thursday.

Ms Dorries added: "I am hoping that they expedite those investigations and that those investigations result in the removal of Russia Today's licence so that they're never again able or have the platform to broadcast their propaganda into the UK."

Transmitted lighting uses light that shines through the evidence toward the camera's lens. The background becomes shadow-free. The angle of the transmitted lighting can be adjusted from 90-degrees to 45-degrees for the desired effect.

In direct reflective lighting the light is reflected directly off the subject into the lens. This is done by placing the subject at a 10-degree angle from the lens to film plane and placing the light source at a 10-degree angle from the subject. The light source reflects at a 20-degree angle into the lens.

Oblique lighting uses a light source positioned at a low angle. Oblique lighting is usually used to show detail by creating shadows on the surface of the evidence.

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The EU said it was preventing RT and Sputnik, both state-owned broadcasters, from being received across Europe until the aggression towards Ukraine ends.

Transmittedlight

In a statement, the EU said RT and Sputnik promoted "systematic information manipulation and disinformation by the Kremlin".

Meanwhile, the BBC has halted all content licensing with its Russian customers. The corporation's commercial arm BBC Studios said: "In common with other media organisations, we have been monitoring events closely.

45-degree lighting is used for photographing the average item of evidence where the objective is to show the item's shape and size.

Diffused lighting uses an opaque material placed between the light source and the subject to soften the light. This usually results in even lighting with reduced reflections and hot spots. The opaque material can be as simple as a section of a white bed sheet or an empty water bottle, or can be a commercial device designed for laboratory photography.

She also said: "Of course, politicians have absolutely no influence over the free press and nor should they. That is the responsibility of the regulator Ofcom. And the very first thing I did was wrote to Ofcom to urge them to review the output of Russia Today."

Obliquelighting eye exam

Bounce lighting uses light bounced off a white or reflective surface. The bounce surface may be positioned at different locations (above or to one side of the subject) to create the desired effect. This usually produces even non-glare lighting with low contrast.

Obliqueillumination microscopy

45-degree lighting uses one or more lights positioned at 45-degree angles. If only one light is used, a white or silver reflector can be placed on the opposite side of the evidence to reflect some of the light back toward the evidence, reducing shadows.

Although the UK is no longer in the EU, the bloc applied sanctions to satellite companies in Luxembourg and France, which provided the RT feed to Sky, Freesat and Freeview.

"And we have contacted both [Facebook owner] Meta and TikTok to implore them to stop streaming Russia Today via their own online platforms.